CN102238680A - Heterogeneous network switching control method, signal transmission method, equipment and communication system - Google Patents

Abstract

The embodiment of the invention discloses a heterogeneous network switching control method, a signal sending method, equipment and a communication system. In the embodiment of the present invention, the adjacent/coverage overlapping base stations all adopt the combined design of the first type carrier and the second type carrier, and at least one pair of the first type carrier and the second type carrier of the adjacent/overlapping base station Base stations with the same frequency and adjacent/overlapping coverage send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send CRS on the second type of carrier, so it can ensure that the UE is in the same During frequency measurement, the accuracy of the cell physical control channel mobility measurement results of adjacent/coverage overlapping base stations, as well as the timeliness of measurement reporting triggers; and it can better ensure the service continuity of users and avoid Unnecessary uplink/downlink data channel interference.

Description

Heterogeneous network handover control method, signal transmission method, device, and communication system

technical field

The present invention relates to the technical field of communication, in particular to a heterogeneous network handover control method, a signal sending method and equipment, and a communication system.

Background technique

With the continuous evolution of communication systems, some cell/network communication nodes suitable for different scenarios and with different coverages have emerged.

Taking the Long Term Evolution/LTE-Advanced (LTE/LTE-A, Long Term Evolution/LTE-Advanced) system of the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) as an example, a system suitable for home/office coverage has been developed. Home base station (HeNB, Home eNB), pico eNB suitable for residential area coverage, relay station (Relay) suitable for expanding macro cell edge throughput, and macro base station, etc. Among them, the deployment of various nodes can form a heterogeneous network communication scenario as shown in Figure 1-a. In the middle of some coverage overlapping areas or at the edge of coverage overlapping areas, the uplink and downlink transmission of user equipment (UE, User Equipment) All may be strongly interfered by signals transmitted by neighboring cells. Therefore, interference coordination between two adjacent/overlapping cells will help to improve the spectral efficiency of the system as a whole and the spectral efficiency of edge users.

The interference coordination of the heterogeneous network includes two parts: the interference coordination of the physical control channel and the interference coordination of the physical data channel. Among them, the interference coordination of the physical data channel can be solved by coordinating and scheduling between base stations, and the correct demodulation of the physical control channel is Prerequisite for correct demodulation of the physical data channel.

The deployment of heterogeneous networks may cause strong co-channel interference in the center of the macro cell, resulting in a high probability of physical channel demodulation errors for users in the center of the macro cell. Referring to Figure 1-b, in the prior art, the large carrier of a cell is split into two small carriers (f1, f2), so that the physical control channels of two overlapping/adjacent cells are staggered in frequency; or in The control channels of two overlapping/adjacent cells are staggered in frequency on two different carriers (f1, f2). For example, on the carrier f1 of a large coverage cell, the physical control channel carries physical downlink control channel (PDCCH, Physical Downlink Control Channel) signaling, physical control format indicator channel (PCFICH: Physical Control Format Indicator Channel) signaling, physical hybrid feedback heavy PHICH: Physical Hybrid ARQ Indicator Channel (PHICH: Physical Hybrid ARQ Indicator Channel) signaling and pilot symbols (CRS, Cell-Specific Reference Symbol), etc., while the transmission power of the physical control channel on the carrier f2 of the large coverage cell is zero; while the transmission power of the physical control channel of the small coverage cell The physical control channel on carrier f2 carries PDCCH signaling and CRS, etc., and the transmission power of the physical control channel on carrier f1 of the small coverage cell is zero, thereby realizing the frequency staggering of the control channels of two overlapping/adjacent cells.

During the research and practice of the existing technology, the inventors found that the mechanism for avoiding co-frequency interference in the existing heterogeneous network may cause UEs such as LTE Rel-8/9 versions to perform too many inter-frequency measurements, thus Increase the power consumption of the UE due to inter-frequency measurement; and, when the UE of the Rel-8/9 version enters a cell with a small coverage from a cell with a large coverage, the signal strength of the physical control channel on the carrier f1 is better than that of the physical data channel, while the UE performs mobility measurement on the physical control channel and scheduling measurement on the data channel. At this time, due to the orthogonality of the physical control channels between the two cells, when the UE enters the coverage area of the adjacent cell, the source cell still has good mobility measurement performance, so it cannot trigger the UE's mobility report in time. Cell handover is performed, which may cause strong interference on the physical data channel.

Contents of the invention

Embodiments of the present invention provide a heterogeneous network handover control method, signal transmission method, device, and communication system, which are conducive to reducing the power consumption of UE inter-frequency measurement and ensuring the accuracy of UE's physical control channel mobility measurement of adjacent cells , and the timeliness of the measurement report trigger.

In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:

A physical control channel signal transmission method, comprising:

The first base station sends Physical Downlink Control Channel PDCCH signaling, Physical Control Format Indicator Channel PCFICH signaling, Physical Hybrid Feedback Retransmission Indicator Channel PHICH signaling and pilot symbol CRS on the physical control channel of the first type of carrier. The physical control channel of the carrier sends the CRS;

The second base station adjacent to/overlapping with the first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the physical control channel of the second type of carrier;

Wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, at least one of the second type of carrier of the first base station and At least one carrier of the first type of carriers of the second base station is a carrier of the same frequency as each other.

A heterogeneous network handover control method, comprising:

The first base station receives the measurement report reported by the user equipment UE, and the measurement report carries the same-frequency measurement information of the UE for the first base station and the second base station adjacent to/overlapping with it, wherein the same-frequency measurement information corresponds to The carrier on the measurement frequency point is the first type carrier of the first base station and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type carrier of the first base station and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier bears PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier bears CRS;

making an inter-frequency handover decision according to the same-frequency measurement information;

If the result of the inter-frequency handover decision is that the inter-frequency handover based on the same-frequency measurement is met, a handover request message is sent to the second base station, and the handover request message carries indication information that the same-frequency measurement triggers the inter-frequency handover.

A communication system comprising:

a first base station, and a second base station adjacent/overlapping with the first base station;

The first base station is configured to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send the CRS on the physical control channel of the second type of carrier;

The second base station is used to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send the CRS on the physical control channel of the second type of carrier;

Wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, at least one of the second type of carrier of the first base station and At least one carrier of the first type of carriers of the second base station is a carrier of the same frequency as each other.

A base station, comprising:

The receiving module is configured to receive a measurement report reported by the user equipment UE, the measurement report carrying the same-frequency measurement information of the UE on the base station and a second base station adjacent to or overlapping with it, wherein the same-frequency measurement information The carrier on the corresponding measurement frequency point is the first type carrier of the base station and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type carrier of the base station The carrier of the first type and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier carries CRS;

A judging module, configured to make an inter-frequency handover judgment according to the same-frequency measurement information;

A sending module, configured to send a handover request message to the second base station when the judging module determines that the result of the inter-frequency handover decision satisfies the condition for performing inter-frequency handover based on the same-frequency measurement, and the handover request message carries the same-frequency measurement Instructions for triggering inter-frequency handover.

A communication system comprising:

The base station described in the foregoing embodiments.

It can be seen from the above that in the embodiment of the present invention, the adjacent/overlapping base stations all adopt the combined design of the first type carrier and the second type carrier, and the first type carrier and the second type carrier of the adjacent/overlapping base station At least one pair of co-frequency, adjacent/overlapping base stations transmits PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the second type of carrier, so it can Ensure the accuracy of the mobility measurement results of the cell physical control channel of adjacent/coverage overlapping base stations by the UE during co-frequency measurement, as well as the timeliness of measurement report triggering; and better guarantee the continuity of user services, And avoid unnecessary uplink/downlink data channel interference between neighbors.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Figure 1-a is a schematic diagram of a heterogeneous network provided by the prior art;

FIG. 1-b is a schematic diagram of a carrier design of an adjacent cell provided by the prior art;

Figure 2-a is a schematic diagram of a physical control channel design provided by an embodiment of the present invention;

FIG. 2-b is a schematic diagram of resource block bearing of a physical control channel provided by an embodiment of the present invention;

Fig. 2-c is a schematic diagram of a physical control channel design of a neighboring cell provided by an embodiment of the present invention;

Figure 2-d is a schematic diagram of another neighbor cell physical control channel design provided by the embodiment of the present invention

Fig. 2-e is a schematic diagram of a measurement event and corresponding processing rules provided by an embodiment of the present invention;

Fig. 3 is a schematic flowchart of a method for sending a control channel signal according to Embodiment 1 of the present invention

FIG. 4 is a schematic flowchart of a heterogeneous network handover control method provided by Embodiment 2 of the present invention;

5 is a schematic flowchart of a heterogeneous network handover control method provided by Embodiment 3 of the present invention;

FIG. 6 is a schematic diagram of a communication system provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a base station provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of another communication system provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of another base station provided by an embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a heterogeneous network handover control method, related equipment, and a communication system, which are conducive to reducing the power consumption of UE inter-frequency measurement, ensuring the accuracy of UE's physical control channel mobility measurement of adjacent cells, and measuring The timeliness of reporting triggers.

Each will be described in detail below.

The embodiment of the present invention firstly provides a new physical channel design scheme, see Figure 2-a, in the embodiment of the present invention, base station carrier design is divided into two types: the first type of carrier and the second type of carrier.

In practical applications, a base station (such as base station A) may include multiple first-type carriers and multiple second-type carriers, and one first-type carrier corresponds to one cell. One or more first-type carriers of base station A may be co-frequency carriers with one or more second-type carriers of another base station (such as base station B) adjacent to/overlapping with base station A, and/or, the base station One or more second-type carriers of A and one or more first-type carriers of base station B may be co-frequency carriers. At least one pair of same-frequency carriers among the first-type carrier and the second-type carrier of the adjacent/covering overlapping base station. Wherein, the carrier with the same frequency refers to a carrier with the same center frequency.

The first type of carrier can include all or part of the elements of the physical control channel, for example, it can include physical hybrid feedback retransmission indicator channel (PHICH, Physical hybrid-ARQ indicator channel), physical control format indicator channel (PCFICH, Physical control format indicator channel) , PDCCH and CRS, etc., and elements such as CRS and PDCCH can be distributed in the entire physical control channel frequency band of the first type carrier, and the CRS and PDCCH on the resource block (RB, Resource Block) of the physical control channel on the first type carrier The placement of the signaling can be shown as the PCC in Figure 2-b. The base station sends both CRS and PDCCH signaling on the physical control channel of the first type of carrier, and can also send PHICH on the physical control channel of the first type of carrier. signaling and PCFICH signaling, etc.

The second type of carrier may be designed to include a physical control channel, and the physical control channel on the second type of carrier bears CRS (for example, it may only bear CRS), but does not bear signaling such as PDCCH. In practical applications, the second type of carrier can be designed into two types, one is that the physical control channel on the second type of carrier only transmits CRS at the center frequency of 1.25MHz at normal power, and does not transmit CRS or CRS transmission power is 0 in other positions , and the other is that the entire frequency band of the physical control channel on the second type of carrier transmits CRS at normal power, and the CRS placement position on a resource block of the physical control channel on the second type of carrier can be shown in Figure 2-b SCC1/SCC2 are shown. The base station can only send the CRS on the physical control channel of the second type carrier.

It should be noted that the horizontal axis in FIG. 2-b represents OFDM symbols, and the vertical axis represents carrier frequency/frequency point. Among them, the number of OFDM symbols of the physical control channel can be 1-3. When the number of symbols of the physical control channel is less than 3, after removing the 1 column or 2 columns indicated by the rightmost OFDM symbol in Figure 2-b, we can obtain Schematic diagram of resource blocks corresponding to PCC and SCC.

The heterogeneous network handover method in the embodiment of the present invention is mainly implemented based on the physical channel design scheme shown in FIG. 2-a. Overlapping/adjacent base stations send CRS and PDCCH signaling on the physical control channel of the first type of carrier according to the physical control channel shown in Figure 2-a, and send it on the physical control channel of the second type of carrier CRS etc. For example, referring to Figure 2-c and Figure 2-d, base station A and base station B are base stations with overlapping/adjacent coverage, base station A includes the first type carrier a1 and the second type carrier a2, and base station B includes the first type carrier b1 and the second type of carrier b2.

Wherein, the first-type carrier a1 and the second-type carrier b2 are mutually same-frequency carriers, and the second-type carrier a2 and the first-type carrier b1 are mutually same-frequency carriers. Base station A sends PDCCH signaling and CRS on the physical control channel of the first type carrier a1, and can only send CRS on the physical control channel of the second type carrier a2; The PDCCH signaling and CRS etc. can be sent on the physical control channel of the same-frequency carrier of a2), and the CRS can be sent only on the physical control channel of the second type of carrier b2 (the same-frequency carrier of the first type of carrier a1).

For example, if the UE is currently camping on base station A, if the UE measures the signal strength of the physical control channel of the cell by measuring the CRS, it can measure the physical control channel on the first type carrier a1 and the second type carrier b2 through the same frequency measurement method. Signal strength, or measure the signal strength of the physical control channel on the second type carrier a2 and the first type carrier b1.

Practice has found that since all mobility measurements are performed on CRS, reserving the CRS of the control domain (that is, the physical control channel) of the second type of carrier can ensure the accuracy of the UE's measurement of the physical control channel, and will not affect the adjacent cells. (Same-frequency carrier) PDCCH signaling and other transmissions cause severe interference. If only the 1.25MHz CRS in the middle of the second type of carrier is reserved for UE mobility measurement, it can further reduce the interference to neighboring cell PDCCH without Affects the accuracy of UE mobility measurement. The location where the base station schedules the CRS to a resource block can be determined by the physical cell identity (PCI, Physical Cell Identity) of the cell (for example, the CRS locations of SCC1 and SCC2 in Figure 2-b are different), and the UE needs to start from the 0th and 5th child The synchronization channel of the frame reads the PCI. Although the synchronization channel is located at a fixed position in the physical data channel, since the synchronization channel also requires full network coverage, it is necessary to avoid interference between the synchronization channels of the cell. In the embodiment of the present invention, the base station of the adjacent cell can achieve this by diverging the system subframe numbers of the adjacent cell (that is, making the 0th and 5th subframes of the adjacent cell do not overlap), and avoiding generation of strong interference.

For the UE, the large-scale fading experienced by multiple carriers in a frequency band (band) has a strong similarity. To a certain extent, the large-scale fading of one carrier can be used to evaluate the large-scale fading of another carrier. Fading, therefore, based on the physical channel design scheme of the embodiment of the present invention, under the overlapping/adjacent base stations shown in Figure 2-c and Figure 2-d, if the UE is currently camping on base station A, the UE will The mobility measurement result of the physical control channel on the second type carrier b2 of the base station B can approximately represent the mobility measurement result of the physical control channel on the first type carrier b1 of the base station B, which is based on the same frequency measurement Inter-frequency switching provides the basis.

Practice has proved that a reasonable switching mechanism usually needs to avoid the following two situations:

(1) Ping-pong (Pingpong) effect (that is, frequent switching back and forth between the source cell and the target cell);

(2) Excessively high switching failure rate.

In the embodiment of the present invention, reasonable handover triggers can be carried out by avoiding the following situations: premature handover triggers cause frequent Pingpong and radio link failure (RLF, Radio Link Failure); too late handover triggers cause RLF; unreasonable handover triggers cause Switch operations frequently.

In the homogeneous network system targeted by LTE Rel-8/9, the corresponding processing rules of mobility measurement reporting events and RRM algorithm switching are shown in Figure 2-e. Before the A2 (the quality of the serving cell is better than the threshold) event is reported to trigger the handover, the base station may receive the A3 (the quality of the neighboring cell is better than the serving cell exceeds the threshold) event and the A4 (the quality of the neighboring cell is better than the threshold) event from the UE. A5 (The quality of the serving cell is worse than the threshold 1 and the quality of the neighboring cell is better than the threshold 2) and other events are reported for intra-frequency measurement. In a homogeneous network scenario, this means that the UE needs to perform intra-frequency handover. However, in a heterogeneous network scenario, to ensure that the frequency of the control channel is orthogonal, the UE cannot perform co-frequency handover between adjacent cells after adopting the carrier physical control channel design as shown in Figure 1-b or the embodiment of the present invention . Therefore, if the inter-frequency handover based on the same-frequency measurement cannot be performed (or statistics show that the inter-frequency handover based on the same-frequency measurement will lead to severe ping-pong effects or high handover failure rates), then the A3/A4/A5 event The measurement report will also trigger the base station to configure inter-frequency measurement operations and parameters for the UE. Of course, the inter-frequency measurement parameter configuration needs to be completed with reference to the handover performance of the corresponding inter-frequency cell (carrier) in the heterogeneous network target node.

The following is a detailed description of the signal transmission scheme of the embodiment of the present invention and the inter-frequency handover scheme based on the same frequency measurement through specific embodiments, wherein, the first type of carrier and the second type of carrier covering overlapping/adjacent base stations are used, for example, as shown in FIG. 2-a shows the physical channel design scheme.

Embodiment one

An embodiment of the physical control channel signal transmission method in the embodiment of the present invention may include: the first base station transmits PDCCH signaling, PCFICH signaling, PHICH signaling, and pilot symbol CRS on the physical control channel of the first type of carrier. The physical control channel of the second type of carrier sends CRS; the second base station adjacent to/overlapping with the first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier. The physical control channel of the second type of carrier sends CRS; wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, the first base station At least one carrier of the second type of carrier and at least one carrier of the first type of carrier of the second base station are mutually co-frequency carriers.

Referring to Figure 3, the details may include:

310. The first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling, and pilot symbol CRS on the physical control channel of the first type of carrier, and sends the CRS on the physical control channel of the second type of carrier;

In one application scenario, the first base station may send the pilot symbol CRS and one or more of PDCCH signaling, PCFICH signaling and PHICH signaling on the physical control channels of one or more first-type carriers. etc., CRSs may also be sent on the physical control channels of one or more second-type carriers (for example, only CRSs may be sent).

320. The second base station adjacent to/overlapping with the first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling, and CRS on the physical control channel of the first type of carrier, and sends it on the physical control channel of the second type of carrier CRS.

Wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, at least one of the second type of carrier of the first base station and At least one carrier of the first type of carriers of the second base station is a carrier of the same frequency as each other.

In one application scenario, the second base station can send the pilot symbol CRS and one or more of PDCCH signaling, PCFICH signaling and PHICH signaling on the physical control channels of one or more first-type carriers. etc., CRSs may also be sent on the physical control channels of one or more second-type carriers (for example, only CRSs may be sent).

In practical application, the first base station (or the second base station) can transmit the pilot CRS in the whole frequency band of the physical control channel of the second type carrier; Frequency CRS.

Further, at this time, if the serving base station of the UE is the first base station, the UE performs co-frequency measurement on the first type carrier of the first base station, and can obtain the signal strength of the physical control channel of the second base station at the frequency point, and When the reporting event conditions (such as A2/A3/A4/A5) are met, the measurement report can be reported to the first base station, and if the carrier of the second base station at this frequency point is the second type of carrier, it can trigger the measurement report based on the same frequency The process of performing inter-frequency handover.

It can be seen from the above that in this embodiment, the adjacent/overlapping base stations all adopt the combined design of the first type carrier and the second type carrier, and the first type carrier and the second type carrier of the adjacent/overlapping base station At least one pair of base stations with the same frequency and adjacent/overlapped coverage in the carrier transmits PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the second type of carrier, so It can ensure the accuracy of the mobility measurement results of the cell physical control channel of adjacent/coverage overlapping base stations by the UE during co-frequency measurement, as well as the timeliness of measurement report triggering; and can better ensure the continuity of user services , and avoid unnecessary uplink/downlink data channel interference between neighbors.

Embodiment two

Based on the physical control channel signal transmission mechanism in Embodiment 1, an embodiment of the heterogeneous network handover control method in the embodiment of the present invention may include: the first base station receives the measurement report reported by the user equipment UE, and the measurement report carries the UE's Intra-frequency measurement information of a base station and a second base station adjacent/overlapping with it, wherein the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the first type of carrier of the first base station and the second type of carrier of the second base station. The second type of carrier; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type of carrier of the first base station and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier carries PDCCH Signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier bears CRS; inter-frequency handover judgment is made according to the above-mentioned same-frequency measurement information; if the result of the inter-frequency handover judgment is satisfied If the condition of inter-frequency handover is met, a handover request message is sent to the second base station, and the handover request message carries indication information that intra-frequency measurement triggers inter-frequency handover.

Referring to Figure 4, the details may include:

410. The first base station receives a measurement report reported by the user equipment UE, where the measurement report carries intra-frequency measurement information of the UE on the first base station and a second base station adjacent to or overlapping with it;

Wherein, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the first type carrier of the first base station and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is The second type of carrier of the first base station and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control of the second type of carrier The channel carries the CRS.

In one application scenario, the first base station and the second base station can send pilot symbol CRS and one of PDCCH signaling, PCFICH signaling and PHICH signaling on the physical control channels of one or more first-type carriers. One or more types, etc., can also send CRS on the physical control channel of one or more second-type carriers (for example, CRS can only be sent on the entire frequency band of the second-type carrier’s physical control channel; or, on the second-type carrier The center frequency of the physical control channel of the carrier is 1.25MHz to send CRS. The UE residing under the first base station can adopt the same frequency measurement mode to measure two carriers of the same frequency in the first base station and the second base station (a certain frequency of the first base station) a first-type carrier and a second-type carrier of the second base station, or a certain second-type carrier of the first base station and a certain first-type carrier of the second base station), the signal strength of the physical control channel, And when the event reporting condition (such as A2/A3/A4/A5 event) is met, the measurement report can be reported to the first base station, and the process of performing inter-frequency handover based on the same-frequency measurement can be triggered.

420. The first base station performs an inter-frequency handover decision according to the above-mentioned intra-frequency measurement information;

In an application scenario, the first base station may perform an inter-frequency handover decision by referring to an error offset value of an inter-frequency channel condition estimated by intra-frequency measurement according to the intra-frequency measurement information in the measurement report. Wherein, the decision rule for the inter-frequency handover can be formulated in advance.

For example, the first base station may determine that the quality of the adjacent cell is better than that of the serving cell and exceeds a set threshold when the reporting event of the UE intra-frequency measurement is determined, and the error of the inter-frequency channel condition estimated by the intra-frequency measurement is within the range of the error offset value When it is judged that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; otherwise, it can be determined that the inter-frequency handover does not meet the conditions for performing inter-frequency handover based on the same-frequency measurement.

Or, the first base station may also determine that the reporting event of the UE's intra-frequency measurement is that the quality of the serving cell is worse than threshold 1 and the quality of the neighboring cell is better than threshold 2, and the error of the inter-frequency channel condition estimated by the intra-frequency measurement is within the error offset value When it is within the range, it is judged that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; otherwise, it can be determined that the inter-frequency handover does not meet the conditions for performing inter-frequency handover based on the same-frequency measurement.

Or, when the first base station determines that the reported event of the same-frequency measurement by the UE is that the quality of the adjacent cell is better than the set threshold; The frequency handover meets the condition of performing inter-frequency handover based on the same-frequency measurement; otherwise, it can be determined that the inter-frequency handover does not meet the condition of performing inter-frequency handover based on the same-frequency measurement.

430. If the judgment result of the inter-frequency handover by the first base station satisfies the condition for inter-frequency handover based on the same-frequency measurement, the first base station sends a handover request message to the second base station, and the handover request message carries the inter-frequency handover triggered by the same-frequency measurement Instructions.

The second base station can receive the handover request sent by the first base station, and according to the indication information that the same-frequency measurement triggers the inter-frequency handover, it knows that this handover is an inter-frequency handover based on the same-frequency measurement, and the second base station performs the inter-frequency handover to prepare for the handover for the UE resources, the UE can then access the target base station to implement inter-frequency handover based on intra-frequency measurement.

In addition, if the result of the inter-frequency handover decision by the first base station is that the condition for inter-frequency handover based on intra-frequency measurement is not satisfied, inter-frequency measurement configuration can be performed for the UE, which can then trigger the execution of traditional inter-frequency inter-frequency measurement based on inter-frequency measurement. Switching process.

Further, the first base station may properly adjust the error offset value of inter-frequency measurement and estimation of inter-frequency channel conditions, so as to make it more reasonable and optimized.

In an application scenario, the first base station may control the UE to perform measurement of multiple frequency points and report the measurement results; determine or adjust the error offset value of intra-frequency measurement and estimation of inter-frequency channel conditions according to the measurement results reported by the UE. And/or, after the failure of the inter-frequency handover based on the same-frequency measurement, the network side counts the performance parameters of the failure of the inter-frequency handover based on the same-frequency measurement, and adjusts the error offset of the same-frequency measurement to estimate the inter-frequency channel status according to the performance parameters value; wherein, the performance parameters may include: the probability of radio link failure or ping-pong effect caused by premature handover, the probability of radio link failure caused by too late handover, the probability of frequent handover operations caused by unreasonable handover, and so on.

It can be seen from the above that in this embodiment, the adjacent/overlapping base stations all adopt the combined design of the first type carrier and the second type carrier, and the first type carrier and the second type carrier of the adjacent/overlapping base station At least one pair of base stations with the same frequency and adjacent/overlapped coverage in the carrier transmits PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the second type of carrier, so It can ensure the accuracy of the mobility measurement results of the cell physical control channel of adjacent/coverage overlapping base stations by the UE during co-frequency measurement, as well as the timeliness of measurement report triggering; and can better ensure the continuity of user services , and avoid unnecessary uplink/downlink data channel interference between neighbors; due to the introduction of a mechanism for performing inter-frequency handover based on same-frequency measurement, unnecessary power consumption of UE by inter-frequency measurement can be avoided.

Embodiment Three

For better understanding, the solution of the embodiment of the present invention will be described in more detail below by taking a process in which the UE performs heterogeneous network handover as an example. Referring to FIG. 5, another embodiment of the heterogeneous network handover control method according to the embodiment of the present invention may include:

501. The eNB-A performs measurement control on the UE;

Wherein, eNB-A (source eNB) may instruct UE to periodically or aperiodically measure the signal strength of adjacent/overlapping base stations, and UE may also actively measure the signal strength of neighboring cells.

In an application scenario, the eNB can collect statistics on performance parameters related to performing inter-frequency handover based on intra-frequency measurement. eNB-A can refer to the statistical calculation results of performance parameters of inter-frequency handover based on intra-frequency measurement by the network, and configure reasonable trigger parameters for UE reporting of measurement events (including configuration of relevant limit thresholds, trigger hysteresis, etc.).

In practical application, when eNB configures the trigger parameters in the measurement report event A3/A4/A5, it needs to refer to the result of the same-frequency measurement to trigger the measurement deviation of the inter-frequency handover.

502. The UE reports a measurement report to eNB-A, which carries co-frequency measurement information;

In this embodiment, the measurement report reported by the UE carries the same-frequency measurement information of the UE on eNB-A and its adjacent/overlapping eNB-B, including signal strength information of mobility measurement, etc.;

Wherein, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the first type carrier of eNB-A and the second type carrier of eNB-B; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is The second type of carrier of eNB-A and the first type of carrier of eNB-B; wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control of the second type of carrier The channel carries the CRS.

In one application scenario, eNB-A and eNB-B can send pilot symbol CRS and one of PDCCH signaling, PCFICH signaling and PHICH signaling on the physical control channels of one or more first-type carriers. One or more types, etc., can also send CRS on the physical control channel of one or more second-type carriers (for example, CRS can only be sent in the entire frequency band of the second-type carrier’s physical control channel; or, on the second-type carrier The center frequency of the physical control channel of the carrier is 1.25MHz to send CRS). The UE residing under eNB-A can use the same-frequency measurement method to measure the signal strength of the physical control channel on the two carriers of the same frequency in eNB-A and eNB-B, and meet the event reporting conditions (such as A2/ A3/A4/A5 event), report a measurement report to eNB-A, so as to trigger the process of performing inter-frequency handover based on intra-frequency measurement.

503. The eNB-A receives the measurement report reported by the UE, and performs an inter-frequency handover decision according to the intra-frequency measurement information in the measurement report.

In one application scenario, eNB-A can trigger and report the same-frequency measurement results according to the A3/A4/A5 events of the UE's same-frequency measurement, and perform inter-frequency handover by referring to the same-frequency measurement to estimate the error offset value of the inter-frequency channel condition. judgment. Among them, the error offset value of intra-frequency measurement and estimation of inter-frequency channel conditions can be preset or eNB-A can determine or adjust the error offset value of intra-frequency measurement and estimation of inter-frequency channel conditions according to multiple inter-frequency measurement results reported by UE and/or, after the inter-frequency handover based on the same-frequency measurement fails, the performance parameters of the inter-frequency handover failure based on the same-frequency measurement are calculated through the network, and the error of the inter-frequency channel condition estimation by the same-frequency measurement can be adjusted according to the performance parameters Offset value; wherein, the performance parameter may include: which source cell to which target cell the failed handover is from (which can be identified by the handover identifier), the probability of radio link failure or ping-pong effect caused by premature handover, the probability of radio link failure or ping-pong effect caused by too late handover, The probability of wireless link failure, the probability of frequent handover operations caused by unreasonable handover, and so on.

If the inter-frequency handover requirements for intra-frequency measurement are met, execute step 504; if not, a Measurement Gap can be allocated to the UE, and a standard inter-frequency measurement triggering inter-frequency handover process is performed. At this time, A3 of the UE intra-frequency measurement /A4/A5 event reporting, the trigger source eNB configures the inter-frequency measurement operation and parameters for the UE, of course, the parameter configuration of the inter-frequency measurement needs to be completed by referring to the handover performance of the corresponding inter-frequency cell in the target node of the heterogeneous network, and the standard The process of inter-frequency measurement triggering inter-frequency handover will not be repeated here.

504. eNB-A sends a handover request message to eNB-B;

In practical application, eNB-A can carry the indication information of inter-frequency handover triggered by intra-frequency measurement in the handover request message, and inform eNB-B (target eNB) that this handover is inter-frequency handover triggered by intra-frequency measurement.

505. The eNB-B receives the handover request message sent by the eNB-A, and performs access control on the UE;

Among them, the eNB-B can trigger the inter-frequency handover instruction based on the same-frequency measurement in the handover request message, know that this handover is an inter-frequency handover based on the same-frequency measurement, and perform access control on the UE according to the inter-frequency handover mode. If the UE accesses, corresponding handover resources are prepared for the UE, and step 506 is executed. If the UE is not allowed to access, the process may end.

Furthermore, the network (eNB) can increase the performance statistics of inter-frequency handover triggered by intra-frequency measurement on the basis of the performance statistics of intra-frequency handover triggered by intra-frequency measurement/inter-frequency handover triggered by inter-frequency measurement. Whenever handover failure occurs, the network After reconnection, the network can determine according to the information reported by the UE:

(1) Whether the failure of this handover belongs to the failure of inter-frequency handover based on the same-frequency measurement;

(2) which source cell to which target cell the failed handover is from;

(3) Whether the handover failure is caused by premature handover trigger, too late handover trigger or unreasonable handover trigger.

According to the statistical results of the corresponding performance parameters, the eNB can perform appropriateness evaluation on the inter-frequency handover control parameters such as the measurement event trigger parameters in the inter-frequency handover scenario triggered by the same-frequency measurement, and the error offset value of the inter-frequency channel status estimated by the same-frequency measurement. Adjust to continuously make up for the error caused by inter-frequency handover triggered by inter-frequency measurement instead of inter-frequency measurement, and avoid the Pingpong effect and high handover failure rate caused by inter-frequency handover triggered by inter-frequency measurement as much as possible.

For example, the previous statistics of eNB found that when the error offset value of inter-frequency channel status estimated by intra-frequency measurement is set to S1, the success rate of inter-frequency handover based on intra-frequency measurement is less than 95%. The error offset value is set to S2 (S2<S1), and the inter-frequency handover success rate based on the same-frequency measurement is greater than 98%, then the eNB adjusts the error offset value of the same-frequency measurement to estimate the inter-frequency channel status to S2, so that analogy.

506. The eNB-B sends a handover request confirmation message to the eNB-A, which carries the handover resource information prepared by the eNB-B for the UE.

507. eNB-A receives the handover request confirmation message sent by eNB-B, learns that eNB-B allows UE access, sends a handover command to UE, instructs UE to access eNB-B, and carries eNB-B in the handover command to prepare for UE handover resource information.

At this time, if eNB-A receives the downlink data of the UE, eNB-A can forward the downlink data of the UE to eNB-B. eNB-B buffers the UE's downlink data forwarded by eNB-A.

508. The UE synchronizes uplink to the target cell, and sends a random access request to the eNB-B, which carries a Preamble.

509. The eNB-B allocates uplink radio resources for the UE, and sends a random access response to the UE, which carries the uplink radio resource information (indicating uplink time-frequency resources) allocated by the eNB-B for the UE, and the time advance for the UE to send uplink data Amount (TA, Time AdCanced) and other information.

510. The UE sends a handover confirmation message to the eNB-B;

511. The eNB-B sends a path switch request to the MME, requesting to switch the data transmission path of the UE;

512. The MME sends a user plane update request to the service network management (SGW, Servering Gateway);

513. The SGW switches the transmission path of the UE's downlink data;

514. The SGW sends a user plane update response to the MME;

515. The MME sends a path switching response to the eNB-B, and the eNB-B can learn that the transmission path switching of the UE's downlink data is completed;

516. The eNB-B instructs the eNB-A to release corresponding resources.

eNB-A releases the corresponding resources of the UE, clears the downlink data cache of the corresponding UE, and continues to forward the UE downlink data being transmitted to eNB-B.

Subsequent UE can directly exchange data packets with the network through eNB-B.

It can be seen that in this embodiment, the adjacent/overlapping eNBs (eNB-A and eNB-B) all adopt the combined design of the first type of carrier and the second type of carrier, and the second adjacent/overlapping eNB At least one pair of co-frequency, adjacent/coverage overlapping eNBs in the first type carrier and the second type carrier send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type carrier, and The second type of carrier sends CRS, so it can ensure the accuracy of the mobility measurement results of the cell physical control channel of the neighboring/overlapping base station, as well as the timeliness of the triggering of the measurement report during the same-frequency measurement by the UE; and it can be better It guarantees the service continuity of the user and avoids unnecessary uplink/downlink data channel interference between neighbors; because of the introduction of the mechanism of inter-frequency handover based on the same-frequency measurement, it can avoid unnecessary power consumption of the inter-frequency measurement.

Furthermore, the above handover scheme has good backward compatibility. For example, UEs of LTE Rel-8/Rel-9 can handover and work smoothly without any modification in a heterogeneous network scenario.

Further, in order to better implement the above-mentioned method of the embodiment of the present invention, the embodiment of the present invention also provides corresponding equipment.

Referring to FIG. 6 , an embodiment of the present invention further provides a communication system, including: a first base station 610 , and a second base station 620 adjacent to/overlapping with the first base station 610 .

Wherein, the first base station 610 is used to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send CRS on the physical control channel of the second type of carrier;

The second base station 620 is configured to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send CRS on the physical control channel of the second type of carrier;

Wherein, at least one carrier in the first type of carrier of the first base station 610 and at least one carrier in the second type of carrier of the second base station 620 are mutually co-frequency carriers; and/or, at least one of the second type of carriers in the first base station 610 One carrier and at least one carrier of the first type of carriers of the second base station 620 are mutually co-frequency carriers.

In one application scenario, the first base station 610 (or the second base station 620) can transmit CRS in the entire frequency band of the physical control channel of the second type of carrier; or, at the center frequency of 1.25MHz of the physical control channel of the second type of carrier Send CRS.

Further, at this time, if the serving base station of the UE is the first base station 610, the UE performs co-frequency measurement on the first type carrier of the first base station 610, and can obtain the signal of the physical control channel of the second base station 620 at this frequency point Intensity, and can report the measurement report to the first base station 610 when the reporting event condition (such as A2/A3/A4/A5) is met, if the carrier of the second base station 620 on this frequency point is a second type of carrier, then it can Trigger the process of performing inter-frequency handover based on intra-frequency measurement.

It can be understood that the first base station 610 in this embodiment can be like the eNB-A in the above method embodiment, and the second base station 620 can be like the eNB-B in the above method embodiment, which can be used to implement all the solutions. For the specific implementation process, refer to Relevant descriptions in the foregoing method embodiments will not be repeated here.

It can be seen from the above that in this embodiment, the adjacent/coverage overlapping base stations (the first base station 610 and the first base station 620) all adopt the combined design of the first type carrier and the second type carrier, and the adjacent/coverage overlap At least one pair of the first type of carrier and the second type of carrier of the stacked base station have the same frequency, and the adjacent/coverage overlapping base stations send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier , and send CRS on the second type of carrier, so it can ensure the accuracy of the mobility measurement results of the cell physical control channel of the neighboring/overlapping base station when the UE performs co-frequency measurement, as well as the timeliness of triggering the measurement report; And it can better guarantee the service continuity of the user, and avoid unnecessary uplink/downlink data channel interference between adjacent intervals.

Referring to FIG. 7 , the embodiment of the present invention also provides a base station 700 , including: a receiving module 710 , a judging module 720 and a sending module 730 .

Wherein, the receiving module 710 is configured to receive a measurement report reported by the UE, the measurement report carrying the same-frequency measurement information of the UE on the base station and a second base station adjacent to or overlapping with it, wherein the same-frequency measurement information corresponds to The carrier on the measurement frequency point is the first type carrier of the base station 700 and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type carrier of the base station 700 and the first type carrier of the second base station;

Wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier carries CRS;

Judgment module 720, configured to perform inter-frequency handover judgment according to the above-mentioned same-frequency measurement information;

The sending module 730 is configured to send a handover request message to the second base station when the judging module 720 judges that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement, and the handover request message carries an indication that the same-frequency measurement triggers the inter-frequency handover information.

The second base station can receive the handover request sent by the first base station, and learn the inter-frequency handover based on the same-frequency measurement during this handover according to the instruction information of the same-frequency measurement triggering the inter-frequency handover, and the second base station performs the inter-frequency handover to prepare for the handover for the UE resources, the UE can then access the target base station to implement inter-frequency handover based on intra-frequency measurement.

In an application scenario, the judgment module 720 is specifically configured to, according to the same-frequency measurement information, refer to the same-frequency measurement and estimate the error offset value of the inter-frequency channel condition to make an inter-frequency handover decision.

Wherein, the judgment module 720 may include:

The first decision sub-module is used to determine that the reported event of the UE same-frequency measurement is that the quality of the adjacent cell is better than that of the serving cell and exceeds the set threshold, and the error of the same-frequency measurement and estimated inter-frequency channel conditions is within the range of the error offset value When it is determined that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; or,

The second decision sub-module is used to determine that the reporting event of UE intra-frequency measurement is that the quality of the serving cell is worse than threshold 1 and the quality of adjacent cells is better than threshold 2, and the error of inter-frequency channel status estimated by intra-frequency measurement is within the error offset When it is within the value range, it is judged that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; or,

The third judgment submodule is used to determine that the reported event of the UE same-frequency measurement is that the quality of the adjacent cell is better than the set threshold, and the error of the same-frequency measurement and estimated inter-frequency channel conditions is within the range of the error offset value, It is determined that the inter-frequency handover satisfies the condition for performing inter-frequency handover based on the same-frequency measurement.

In an application scenario, the base station 700 may further include:

The trigger module is configured to perform inter-frequency measurement configuration for the UE when the judging module 720 determines that the inter-frequency handover does not meet the conditions for performing inter-frequency handover based on the same-frequency measurement. Furthermore, it can trigger the execution of a traditional process of performing inter-frequency handover based on inter-frequency measurement.

In an application scenario, the base station 700 may further include:

A control module, configured to control the UE to perform multiple inter-frequency measurements and report the measurement results;

The first adjustment module is configured to determine or adjust the error offset value of intra-frequency measurement and estimation of inter-frequency channel conditions according to the measurement results reported by the UE.

In an application scenario, the base station 700 may further include:

The second adjustment module is configured to, after the inter-frequency handover based on the same-frequency measurement fails, perform statistics on the performance parameters of the inter-frequency handover failure based on the same-frequency measurement, and adjust the error of the same-frequency measurement to estimate the inter-frequency channel status with reference to the performance parameters Offset value; wherein, the performance parameter may include: the probability of radio link failure or ping-pong effect caused by premature handover, the probability of radio link failure caused by too late handover, and the probability of frequent handover operations caused by unreasonable handover.

It can be understood that the base station 700 in this embodiment can be used to implement all solutions like the eNB-A in the above method embodiment, and its specific implementation process refers to the relevant description in the above method embodiment, and details are not repeated here.

It can be seen that in this embodiment, the adjacent/coverage overlapping base stations (base station 700 and the second base station) all adopt the combined design of the first type carrier and the second type carrier, and the first adjacent/coverage overlapping eNB There is at least one pair of co-frequency, adjacent/overlapped base stations in the first type carrier and the second type carrier to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type carrier, and The CRS is sent by a similar carrier, so it can ensure the accuracy of the mobility measurement results of the cell physical control channel of the adjacent/overlapping base station, as well as the timeliness of the triggering of the measurement report during the same-frequency measurement by the UE; and it can better Guarantee the service continuity of users and avoid unnecessary uplink/downlink data channel interference between neighbors; due to the introduction of the mechanism of inter-frequency handover based on co-frequency measurement, it can avoid the consumption of UE power by unnecessary inter-frequency measurement.

Furthermore, the above handover scheme has good backward compatibility. For example, UEs of LTE Rel-8/Rel-9 can handover and work smoothly without any modification in a heterogeneous network scenario.

The embodiment of the present invention also provides a communication system, including: a base station 810, and another base station 820 adjacent to/overlapping with the base station 810.

Among them, the base station 810 is used to receive the measurement report reported by the UE. The measurement report carries the same-frequency measurement information of the UE to the base station 810 and another base station 820, wherein the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the base station The first type carrier of 810 and the second type carrier of another base station 820; or, the carrier on the measurement frequency point corresponding to the same frequency measurement information is the second type carrier of base station 810 and the first type carrier of another base station 820 ; Wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier carries CRS; the inter-frequency handover decision is made according to the above-mentioned same-frequency measurement information; if If the result of the inter-frequency handover decision satisfies the condition for performing inter-frequency handover based on the same-frequency measurement, a handover request message is sent to another base station 820, and the handover request message carries indication information that the same-frequency measurement triggers inter-frequency handover.

Another base station 820 receives the handover request sent by the base station 810, and may perform UE access control according to the inter-frequency handover mode.

In addition, if the result of the inter-frequency handover decision is that the condition for performing inter-frequency handover based on the same-frequency measurement is not satisfied, inter-frequency measurement configuration is performed for the UE. Furthermore, it can trigger the execution of a traditional process of performing inter-frequency handover based on inter-frequency measurement.

It can be understood that the base station 810 in this embodiment can be like the eNB-A in the above method embodiment, and the base station 820 can be like the eNB-B in the above method embodiment, which can be used to implement all the solutions. For the specific implementation process, refer to the above method embodiment Relevant descriptions in , will not be repeated here.

An embodiment of the present invention also provides a communication system, which may include: a base station 700 .

The embodiment of the present invention also provides a base station 900, including:

The first sending module 910 is configured to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type carrier of the base station 900;

The second sending module 920 is configured to send the CRS on the physical control channel of the second type carrier of the base station 900 .

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

To sum up, in the embodiment of the present invention, the adjacent/coverage overlapping base stations all adopt the combined design of the first type carrier and the second type carrier, and the first type carrier and the second type carrier of the adjacent/overlapping base station At least one pair of co-frequency, adjacent/overlapping base stations transmits PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the second type of carrier, so it can guarantee When the UE performs co-frequency measurement, the accuracy of the cell physical control channel mobility measurement results of adjacent/coverage overlapping base stations, as well as the timeliness of measurement reporting; and can better ensure the continuity of user services and avoid Unnecessary uplink/downlink data channel interference between neighbors; due to the introduction of a mechanism for inter-frequency handover based on intra-frequency measurement, unnecessary inter-frequency measurement can avoid UE power consumption.

Furthermore, the above-mentioned inter-frequency handover scheme has good backward compatibility. For example, UEs of LTE Rel-8/Rel-9 versions can switch and work smoothly without any modification in a heterogeneous network scenario.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: Read-only memory, random access memory, magnetic disk or optical disk, etc.

The above is a detailed introduction of the heterogeneous network handover control method, signal transmission method, equipment and communication system provided by the embodiments of the present invention. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The above embodiments The description is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, The contents of this description should not be construed as limiting the present invention.

Claims (16)

1. A physical control channel signal transmission method, characterized in that, comprising: The first base station sends Physical Downlink Control Channel PDCCH signaling, Physical Control Format Indicator Channel PCFICH signaling, Physical Hybrid Feedback Retransmission Indicator Channel PHICH signaling and pilot symbol CRS on the physical control channel of the first type of carrier. The physical control channel of the carrier sends the CRS; The second base station adjacent to/overlapping with the first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and sends CRS on the physical control channel of the second type of carrier; Wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, at least one of the second type of carrier of the first base station and At least one carrier of the first type of carriers of the second base station is a carrier of the same frequency as each other. 2. The method of claim 1, wherein, The sending CRS on the physical control channel of the second type of carrier includes: transmit the CRS over the entire frequency band of the physical control channel of the second type of carrier; or, The CRS is sent at the center frequency of 1.25MHz of the physical control channel of the second type of carrier. 3. A heterogeneous network handover control method, characterized in that, comprising: The first base station receives the measurement report reported by the user equipment UE, and the measurement report carries the same-frequency measurement information of the UE for the first base station and the second base station adjacent to/overlapping with it, wherein the same-frequency measurement information corresponds to The carrier on the measurement frequency point is the first type carrier of the first base station and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type carrier of the first base station and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier bears PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier bears CRS; making an inter-frequency handover decision according to the same-frequency measurement information; If the result of the inter-frequency handover decision is that the inter-frequency handover based on the same-frequency measurement is met, a handover request message is sent to the second base station, and the handover request message carries indication information that the same-frequency measurement triggers the inter-frequency handover. 4. The method of claim 3, wherein, The inter-frequency handover decision according to the same-frequency measurement information includes: According to the intra-frequency measurement information, the inter-frequency handover decision is made with reference to the error offset value of the intra-frequency measurement and estimated inter-frequency channel conditions. 5. The method of claim 4, wherein, Making an inter-frequency handover decision according to the same-frequency measurement information includes: When it is determined that the reported event of the same-frequency measurement of the UE is that the quality of the adjacent cell is better than that of the serving cell and exceeds the set threshold, and the error of the inter-frequency channel status estimated by the same-frequency measurement is within the range of the error offset value, the inter-frequency handover is decided Satisfy the conditions for inter-frequency handover based on intra-frequency measurements; or, When it is determined that the reporting event of the UE intra-frequency measurement is that the quality of the serving cell is worse than threshold 1 and the quality of the neighboring cell is better than threshold 2, and the error of the inter-frequency channel condition estimated by the intra-frequency measurement is within the range of the error offset value, Judging that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; or, When it is determined that the reported event of the same-frequency measurement of the UE is that the quality of the adjacent cell is better than the set threshold; Frequency measurement to perform inter-frequency handover conditions. 6. The method according to any one of claims 3 to 5, characterized in that, If the result of the inter-frequency handover decision is that the condition for performing inter-frequency handover based on the intra-frequency measurement is not satisfied, inter-frequency measurement configuration is performed for the UE. 7. The method according to claim 4, characterized in that the method further comprises: Control the UE to perform multiple inter-frequency measurements and report the measurement results; According to the measurement result reported by the UE, determine or adjust an error offset value for inter-frequency measurement and estimation of inter-frequency channel conditions. 8. The method according to claim 4, further comprising: After the inter-frequency handover failure based on the same-frequency measurement, the performance parameter of the inter-frequency handover failure based on the same-frequency measurement is calculated, and the error offset value of the same-frequency measurement and estimation of the inter-frequency channel condition is adjusted with reference to the performance parameter; Wherein, the performance parameters include: The probability of radio link failure or ping-pong effect caused by premature handover, the probability of radio link failure caused by too late handover, and the probability of frequent handover operations caused by unreasonable handover. 9. A communication system, characterized in that it comprises: a first base station, and a second base station adjacent/overlapping with the first base station; The first base station is configured to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send the CRS on the physical control channel of the second type of carrier; The second base station is used to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS on the physical control channel of the first type of carrier, and send the CRS on the physical control channel of the second type of carrier; Wherein, at least one carrier of the first type of carrier of the first base station and at least one carrier of the second type of carrier of the second base station are mutually co-frequency carriers; and/or, at least one of the second type of carrier of the first base station and At least one carrier of the first type of carriers of the second base station is a carrier of the same frequency as each other. 10. A base station, characterized in that, comprising: The receiving module is configured to receive a measurement report reported by the user equipment UE, the measurement report carrying the same-frequency measurement information of the UE on the base station and a second base station adjacent to or overlapping with it, wherein the same-frequency measurement information The carrier on the corresponding measurement frequency point is the first type carrier of the base station and the second type carrier of the second base station; or, the carrier on the measurement frequency point corresponding to the same-frequency measurement information is the second type carrier of the base station The carrier of the first type and the first type of carrier of the second base station; wherein, the physical control channel of the first type of carrier carries PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; the physical control channel of the second type of carrier carries CRS; A judging module, configured to make an inter-frequency handover judgment according to the same-frequency measurement information; A sending module, configured to send a handover request message to the second base station when the judging module determines that the result of the inter-frequency handover decision satisfies the condition for performing inter-frequency handover based on the same-frequency measurement, and the handover request message carries the same-frequency measurement Instructions for triggering inter-frequency handover. 11. The base station according to claim 10, characterized in that, The judgment module is specifically configured to, according to the same-frequency measurement information, refer to the error offset value of the same-frequency measurement and estimate the inter-frequency channel condition to make an inter-frequency handover decision. 12. The base station according to claim 11, characterized in that, The judgment module includes, including: The first decision submodule is used to determine that the reported event of the UE same-frequency measurement is that the quality of the adjacent cell is better than that of the serving cell and exceeds the set threshold, and the error of the same-frequency measurement and estimated inter-frequency channel conditions is within the error offset value When it is within the range, it is determined that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; or, The second judgment submodule is used to determine that the reported event of the UE intra-frequency measurement is that the quality of the serving cell is worse than threshold 1 and the quality of the adjacent cell is better than threshold 2, and the error of the inter-frequency channel condition estimated by the intra-frequency measurement is within the error When within the range of the offset value, it is determined that the inter-frequency handover meets the conditions for performing inter-frequency handover based on the same-frequency measurement; or, The third judgment submodule is used to determine that the reported event of the same-frequency measurement of the UE is that the quality of the adjacent cell is better than the set threshold; and the error of the inter-frequency channel condition estimated by the same-frequency measurement is within the range of the error offset value , it is judged that the inter-frequency handover satisfies the condition of performing inter-frequency handover based on the same-frequency measurement. 13. The base station according to any one of claims 10 to 12, further comprising: A triggering module, configured to perform inter-frequency measurement configuration for the UE when the judging module determines that inter-frequency handover does not meet the conditions for performing inter-frequency handover based on intra-frequency measurement. 14. The base station according to claim 11, further comprising: A control module, configured to control the UE to perform multiple inter-frequency measurements and report the measurement results; The first adjustment module is configured to determine or adjust an error offset value of intra-frequency measurement and estimation of inter-frequency channel conditions according to the measurement result reported by the UE. 15. The base station according to claim 11, further comprising: The second adjustment module is used to calculate the performance parameters of the failure of the inter-frequency handover based on the same-frequency measurement after the inter-frequency handover based on the same-frequency measurement fails, and adjust the error of the same-frequency measurement to estimate the inter-frequency channel status with reference to the performance parameters offset value; Wherein, the performance parameters include: The probability of radio link failure or ping-pong effect caused by premature handover, the probability of radio link failure caused by too late handover, and the probability of frequent handover operations caused by unreasonable handover. 16. A communication system, characterized in that it comprises: The base station according to any one of claims 10 to 15.

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