CN107342839A - Link circuit self-adapting method of adjustment and device - Google Patents
Link circuit self-adapting method of adjustment and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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Abstract
The invention discloses a kind of link circuit self-adapting method of adjustment and device, methods described to include：Specified receiving node reporting channel quality measurement result in sending node instruction service groups；The sending node determines modulation and the coded system of service groups according to the channel quality measurements, and the service groups include at least one receiving node.The embodiment of the present invention indicates the specified receiving node reporting channel quality measurement result in service groups by sending node, channel quality measurements according to reporting determine modulation and the coded system of the service groups, so that the sending node can use suitable modulation and coded system when subsequently transmitting data for the receiving node in service groups, it is possible to increase the efficiency of transmission of business datum.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a link self-adaptive adjusting method and device.
Background
The mobile service is based on the service type in the mobile communication environment, and the development space of the mobile service is larger along with the development of the wireless mobile communication technology. Currently, mobile services are mainly classified into point-to-point services (e.g., unicast services) and point-to-multipoint services (e.g., broadcast multicast services, group call services).
For Point-to-Multipoint services, 3GPP has 3 transmission mechanisms to solve the Point-to-Multipoint services, which are enhanced Multimedia Broadcast Multicast Service (eMBMS), Single Cell Point to Multipoint (SC-PTM) and Unicast (Unicast), respectively.
The link adaptation technique, Adaptive Modulation and Coding (AMC), is to adaptively and dynamically adjust the information data rate to match the wireless channel capacity of each terminal. AMC can achieve very efficient transmission of packet data over the wireless air interface.
For eMBMS and SC-PTM, there is no adaptive modulation and coding mechanism of the physical layer, and in order to meet the Quality of Service (QoS) requirement of the Service, the sending node may only select a Service that is delivered to the terminal in a relatively conservative modulation and coding manner, so that the transmission efficiency of the data Service is very low.
Disclosure of Invention
The invention provides a link self-adaptive adjusting method and device, which are used for improving the transmission efficiency of data services.
In a first aspect, an embodiment of the present invention provides a link adaptive adjustment method, including:
a sending node indicates a designated receiving node in a service group to report a channel quality measurement result, wherein the service group comprises at least one receiving node;
and the transmitting node determines the modulation and coding mode of the service group according to the channel quality measurement result.
In a second aspect, an embodiment of the present invention further provides a link adaptive adjustment apparatus, including:
an indication reporting measurement result module configured in the sending node, for indicating a designated receiving node in a service group to report a channel quality measurement result, wherein the service group comprises at least one receiving node;
and the modulation and coding mode determining module is configured in the sending node and is used for determining the modulation and coding mode of the service group according to the channel quality measurement result.
In the embodiment of the invention, the sending node indicates the appointed receiving node in the service group to report the channel quality measurement result, the service group comprises at least one receiving node, and the modulation and coding mode of the service group is determined according to the reported channel quality measurement result, so that the sending node can adopt a proper modulation and coding mode when transmitting data for the receiving node in the service group subsequently, thereby improving the transmission efficiency of the service data. Especially aiming at point-to-multipoint service, the air interface efficiency of transmission can be effectively improved.
Drawings
Fig. 1A is a flowchart of a link adaptive adjustment method according to a first embodiment of the present invention;
fig. 1B is a schematic diagram of a mapping table of CQI and modulation and coding scheme in a link adaptive adjustment method according to a first embodiment of the present invention;
fig. 1C is a schematic diagram of a mapping table among CQI, MCS, modulation and coding schemes in a link adaptive adjustment method according to a first embodiment of the present invention;
fig. 2A is a flowchart of a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 2B is a schematic diagram illustrating a first critical ue determination in a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 2C is a schematic diagram illustrating a second determination of a critical ue in a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 2D is a schematic diagram illustrating a third determination of critical ue in a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 2E is a schematic diagram of an FDD frame configuration method in a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 2F is a schematic diagram of a TDD frame configuration in a link adaptive adjustment method according to a second embodiment of the present invention;
fig. 3A is a flowchart of a link adaptive adjustment method in the third embodiment of the present invention;
fig. 3B is a schematic diagram illustrating a first edge ue determining method in a link adaptive adjustment method according to a third embodiment of the present invention;
fig. 3C is a schematic diagram illustrating a second edge ue determining method in a link adaptive adjustment method according to a third embodiment of the present invention;
fig. 4 is a structural diagram of a link adaptive adjustment apparatus in a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1A is a flowchart of a link adaptive adjustment method according to an embodiment of the present invention, where this embodiment is applicable to a case where data communication is performed by adaptively adjusting a modulation and coding scheme of a service group, for example, a point-to-multipoint service, and the method may be executed by a link adaptive adjustment apparatus according to an embodiment of the present invention, where the link adaptive adjustment apparatus may be implemented by software or hardware, the link adaptive adjustment apparatus is integrated in a sending node, and an execution main body of this embodiment is the sending node integrated with the link adaptive adjustment apparatus according to an embodiment of the present invention, as shown in fig. 1A, and specifically includes:
s101, a sending node indicates a designated receiving node in a service group to report a channel quality measurement result, wherein the service group comprises at least one receiving node.
The receiving node may be, but is not limited to being, a terminal, and the transmitting node may be, but is not limited to being, a terminal or a base station. The terminal may be, but is not limited to, a mobile terminal, a tablet computer, and a fixed terminal. The base station may be, but is not limited to, a base station in a 2G, 3G, 4G network. The designated receiving node may be one or more, specifically, may be a receiving node in the service group that meets a preset condition, where the preset condition may be that a coverage requirement is met and a wireless signal measurement value is equal to a wireless signal measurement threshold value, or that the coverage requirement is met and the wireless signal measurement value is a minimum value. Here, a receiving node that satisfies the coverage requirement and the wireless signal measurement value is equal to the wireless signal measurement threshold value is defined as a critical receiving node, and a receiving node that satisfies the coverage requirement and the wireless signal measurement value is the lowest value is defined as an edge receiving node. The designated receiving node may also be other receiving nodes in a service group pre-designated by the sending node, and is not specifically limited herein. In this implementation, the Channel Quality measurement result is a Channel Indicator characterizing a link state, and may be measured, but not limited to, using a Channel Quality Indicator (CQI) and/or an Indicator characterizing Channel spatial information. The present embodiment is applicable to point-to-multipoint services, such as multicast, in which a plurality of receiving nodes form a receiving node group and communicate with a transmitting node in the form of a group.
Specifically, before executing this step, the sending node first determines which receiving nodes in the service group the designated receiving node is, for example, the sending node determines, according to a preset condition, the receiving node that satisfies the preset condition as the designated receiving node, or randomly selects one or more receiving nodes in the service group as the designated receiving nodes.
S102, the sending node determines the modulation and coding mode of the service group according to the channel quality measurement result.
The modulation and coding mode comprises a modulation mode and a code rate. For example, the Modulation scheme may be, but is not limited to, Quadrature Phase Shift Keying (QPSK), 16-symbol Quadrature Amplitude Modulation (16 QAM), 64-symbol 64QAM, and the like, and the corresponding code rate may be, but is not limited to, 1/3, 1/2, 2/3, 4/5, and the like. Specifically, a designated receiving node in the service group periodically or aperiodically measures the channel quality of the downlink state under the instruction of the sending node, and reports the measurement result to the sending node. The sending node can obtain the channel quality measurement result of the appointed receiving node after receiving the channel quality measurement result, so that the modulation and coding mode suitable for the service group is obtained, and the sending node can adopt the determined modulation and coding mode when transmitting data to the receiving node in the service group subsequently, so that the data transmission efficiency is improved.
In specific implementation, the receiving node uses different channel quality measurement results to represent corresponding modulation and coding modes, and establishes a mapping table between the channel quality measurement results and the modulation and coding modes. The channel quality measurement result is a channel indicator characterizing a link status, and the channel indicator may be measured by, but not limited to, using CQI and/or an indicator characterizing channel spatial information, where the indicator characterizing channel spatial information includes, but is not limited to, at least one of: a Rank Indicator (RI) factor, a Precoding Matrix Indicator (PMI) factor, and an elevation Indicator (AI) factor.
Specifically, the receiving node divides the modulation and coding modes in advance according to the channel indication factor, forms a mapping table of the channel indication factor and the modulation and coding modes, and synchronizes the table to the transmitting node, so that the transmitting node establishes a mapping relationship between the MCS and the channel indication factor as well as between the modulation and coding modes. For example, when the channel indicator is a channel quality indicator CQI, the receiving node divides the modulation and coding scheme according to the CQI to obtain a mapping table of the CQI and the modulation and coding scheme, as shown in fig. 1B. The CQI value may be obtained by indicating a designated receiving node in the service group to perform channel measurement and report, and after obtaining the CQI, the transmitting node may obtain a modulation and coding scheme corresponding to the service group by querying a mapping table shown in fig. 1C.
Similarly, the modulation and coding modes may also be divided according to the indication factors (e.g., rank indication factor RI, precoding matrix indication factor PMI, and height indication factor AI) representing the channel spatial information, so as to obtain the mapping table of each factor and the modulation and coding mode.
In this embodiment, a sending node indicates a designated receiving node in a service group to report a channel quality measurement result, and determines a modulation and coding mode of the service group according to the reported channel quality measurement result, so that the sending node can adopt an appropriate modulation and coding mode when transmitting data for the receiving node in the service group in the following, and the transmission efficiency of service data can be improved. Especially aiming at point-to-multipoint service, the air interface efficiency of transmission can be effectively improved.
On the basis of the above embodiments, to further improve the data transmission efficiency, the Target Block error rate (TargetBLER) requirement of a group of receiving nodes that simultaneously receive a certain service under a certain coverage condition is met, where TargetBLER is the BLER requirement of the receiving nodes in the group that simultaneously receive a certain service. Specifically, the method further comprises:
the sending node determines an outer ring factor according to the TargetBLER;
the step of determining, by the sending node, the modulation and coding mode of the designated receiving node according to the channel quality measurement result includes:
the sending node instructs the appointed receiving node to send hybrid automatic repeat request (HARQ) feedback information;
and the transmitting node determines the modulation and coding mode of the appointed receiving node according to the channel quality measurement result, the HARQ feedback information and the outer ring factor.
Here, the initial value of the outer loop factor is generally set to 0, and then adjustment is performed according to a feedback condition of a Hybrid Automatic Repeat ReQuest (HARQ). Specifically, the determining, by the sending node, the modulation and coding mode of the designated receiving node according to the channel quality measurement result, HARQ feedback information, and the outer loop factor includes:
if the sending node determines that the HARQ feedback information is an acknowledgement character ACK, an outer ring ascending step length is added on the basis of the outer ring factor;
the transmitting node determines the modulation and coding mode of the appointed receiving node according to the increased outer ring factor and the channel quality measurement result;
or,
the sending node determines that the HARQ feedback information is a non-acknowledgement character NACK, and then subtracts an outer ring descending step length on the basis of the outer ring factor;
and the transmitting node determines the modulation and coding mode of the appointed receiving node according to the subtracted outer ring factor and the channel quality measurement result.
The value range of the outer ring ascending step length is preferably but not limited to [0.01,1 ]; and/or, the value range of the outer ring descending step length is preferably but not limited to [0.01,5 ]. The ratio of the outer ring up step to the outer ring down step may be, but is not limited to, TargetBLER (1-TargetBLER).
Specifically, the sending node further establishes a mapping table among the channel quality measurement result, a modulation and coding scheme representing a relative value MCS of the modulation and coding scheme, and the modulation and coding scheme according to the channel quality measurement result and the modulation and coding scheme mapping table reported by the receiving node, and the sending node firstly determines the MCS corresponding to the channel quality measurement result according to the mapping table and then adjusts the MCS according to the HARQ feedback information. For example, when the HARQ feedback information is ACK, an outer loop up step is added on the basis of the MCS, or when the HARQ feedback information is NACK, an outer loop down step is subtracted on the basis of the MCS. And then, determining the modulation and coding mode corresponding to the adjusted MCS again according to the mapping table, and using the modulation and coding mode as the modulation and coding mode finally used by the service group.
On the basis of the foregoing embodiment, the determining, by the sending node, the modulation and coding scheme of the service group according to the channel quality measurement result further includes:
when the designated receiving node is multiple and the corresponding channel quality measurement results are multiple, the sending node forms a channel quality measurement result set by the multiple channel quality measurement results, and selects one channel quality measurement result from the set as the channel quality measurement result of the service group;
and the transmitting node determines the modulation and coding mode of the service group according to the channel quality measurement result of the service group.
For example, the present embodiment will be described with the channel quality measurement result as CQI. If at a certain time N, the receiving nodes belonging to the same traffic group R1 include UE11, UE12, UE13, UE14 and UE15, UE11, UE12, UE13, UE14 and UE15, and the CQIs fed back to the transmitting node by measuring the downlink states are 3, 8, 5 and 12, respectively, the CQI corresponding to the traffic group R1 of the transmitting node forms a set { CQI _ i } ═ {3,5,8,12 }. And selecting the minimum CQI from the CQI set as a CQIfeedback of the service group R1, and determining a corresponding modulation and coding mode by the sending node according to the CQIfeedback.
In the embodiment, the sending node indicates the designated receiving node in the service group to report the channel quality measurement result, and determines the modulation and coding mode of the service group according to the reported channel quality measurement result, so that the sending node can adopt a proper modulation and coding mode when transmitting data for the receiving node in the service group subsequently, and the transmission efficiency of the service data can be improved. Especially aiming at point-to-multipoint service, the air interface efficiency of transmission can be effectively improved.
Example two
Fig. 2A is a flowchart of a link adaptive adjustment method according to a second embodiment of the present invention, in this embodiment, on the basis of the foregoing embodiment, a step of a sending node determining a critical receiving node according to a radio signal measurement value reported by each receiving node is further added, where the designated receiving node is preferably a critical user equipment, the sending node is preferably a base station, and the channel quality measurement result is preferably a CQI. As shown in fig. 2A, the method specifically includes:
s201, the base station compares the wireless signal measurement value reported by each user equipment in the service group with the wireless signal measurement threshold value, and determines the user equipment lower than the wireless signal measurement threshold value as critical user equipment.
The base station sets the wireless signal measurement threshold according to the coverage rate requirement, and the number of the user equipment of which the set wireless signal measurement threshold is required to be less than the wireless signal measurement threshold is equal to the number of the edge user equipment meeting the coverage rate requirement or the number of the edge user equipment multiplied by the number of the user equipment in a preset proportion.
Specifically, the process of determining the critical ue in this embodiment is described by taking a point-to-multipoint service as an example. It is assumed that currently, N UEs need to receive the point-to-multipoint service sent by the base station at the same time, and the coverage rate is required to be greater than or equal to 10% BLER of 95% of the UEs in the cell. Reference Signal Received Power (RSRP) is used as a wireless Signal measurement. The method mainly comprises the following steps:
A. the base station determines the initial radio signal measurement threshold R _ th1 as its RSRP threshold, as shown in fig. 2B.
B、UEiMeasuring self RSRPiAnd compared with a threshold value R _ th 1.
Wherein the UEiIs the ith UE. If RSRPiR _ th1 ≦ R _ th, then UEiTransferring to cluster RRC _ CONNECTED state and transmitting RSRPiReporting to the eNB; if RSRPi>R _ th1, then UEiAnd transferring to a cluster RRC _ IDEL state.
C. And the base station judges that the number of the UE entering the cluster RRC _ CONNECTED state is M, judges whether M is equal to 5% N of edge users meeting the coverage rate requirement, and adjusts the threshold value of R _ th 1.
D. If M is>5% N, the threshold value R _ th1 needs to be adjusted down to the preset value, for M UEs entering the cluster RRC _ CONNECTED state, the base station finds the RSRP value meeting the condition that M is 5% N according to the RSRP value reported by the base station as the new threshold value R _ th2, and determines the UE corresponding to the threshold valuethIs critical UE, as shown in fig. 2C.
E. If M is<5% N, the threshold R _ th1 needs to be raised to the preset value, and since part of the UEs are in the cluster RRC _ IDEL state during the process of raising the threshold and cannot directly find the threshold meeting the coverage requirement, the base station needs to raise the RSRP threshold to R by itself firstth_tempAnd D, repeating the step B. The base station judges that the number of the new UE entering the cluster RRC _ CONNECTED state is M1Will M1Comparison to 5% N:
F. if M is1And (4) more than or equal to 5% N, repeating the step D to obtain a new RSRP threshold value R _ th2, and determining the UE corresponding to the threshold valuethCritical UE, as shown in fig. 2D.
G. If M is1<And E, repeating the step E, and judging that the number of the new UE entering the cluster RRC _ CONNECTED state is M by the base stationjUp to MjRepeating the step D to obtain a new RSRP threshold value R _ th2,and determining the UE corresponding to the threshold valuethCritical UE, as shown in fig. 2D.
S202, the base station indicates the critical user equipment to report CQI and HARQ feedback information.
When reporting the CQI, the critical user equipment may use periodic reporting or aperiodic reporting. When reporting the CQI periodically, a configuration mode as shown in fig. 2E may be adopted to configure a Frequency Division Duplex (FDD) frame, and the base station configures CQI-pmi-ConfigIndex value I in the CQI-report periodic messageCQI/PMI5, the period N of CQI reportingpd5 sub-frames, offset N within a periodOFFSET,CQI＝ICQI/PMIAnd-2-3 subframe, the CQI reporting time may be denoted as TTI 5 (n-1) +3, n 1,2, ….
When reporting the CQI aperiodically, a configuration manner shown in fig. 2F may be adopted to configure a Time Division Duplex (TDD) frame, and configure the TDD uplink and downlink to 1, and when the UE receives a CSI request field in the DCI format0/4 indicating that the CQI needs to be reported at TTI 1,9, the UE may send aperiodic CQI information on the PUSCH of the first available uplink subframe counted from subframe TTI +4, that is, TTI 7 and TTI 13.
S203, the base station inquires a mapping table among the CQI, the MCS and the modulation and coding mode according to the reported CQI, and determines the MCS corresponding to the CQI.
For the convenience of the following description, the determined MCS corresponding to the CQI is marked as MCSfeedback。
And S204, the base station adjusts the outer ring factor according to the HARQ feedback information.
And the base station determines that the HARQ feedback information is an acknowledgement character ACK, and then an outer ring ascending step length is added on the basis of the outer ring factor. And the base station determines that the HARQ feedback information is a non-acknowledgement character NACK, and subtracts an outer ring descending step length on the basis of the outer ring factor. For example, let targetbller be 10%, initial outer loop factor detlams c ═ 0, outerThe ring up step upttep is 0.01, and the ring down step is-0.09. Specifically, the base station receives the message from the UEthMaintaining the value of detlammcs for HARQ information ofhistoryThe value of the detlammcs maintained from the initial time TTI of 0 to the previous time TTI of N-1, and if the HARQ feedback information received by the base station is ACK feedback information at the time TTI of N, the value of the detlammcs (N) is the detlammcshistory+0.01, if the HARQ feedback information received by the base station is NACK feedback information, the detlaMCS (n) is detlaMCShistory-0.09。
S205, the base station adjusts the outer loop factor and the MCS according to the adjusted outer loop factorfeedbackAnd determining the modulation and coding mode of the service group.
In particular, the MCS may be in thefeedbackAnd on the basis of the adjustment, adding the adjusted outer ring factor, and determining the modulation and coding mode of the service group according to the finally obtained sum. For example, when a certain time TTI is N, mcs (N) corresponding to the critical user equipment UEth may be calculated by the following formula:
MCS(N)＝round(MCSfeedback(N)+detlaMCS(N))
wherein, MCSfeedbackAnd determining an initial MCS for the base station according to the CQI reported by the critical user equipment UEth at the moment of N. And the base station determines the modulation and coding mode of the service group by inquiring a mapping table shown in fig. 1C according to the calculated mcs (n).
EXAMPLE III
Fig. 3A is a flowchart of a link adaptive adjustment method according to a third embodiment of the present invention, and in this embodiment, an operation step of a sending node determining an edge receiving node according to a measured value of a wireless signal reported by each receiving node is further added on the basis of the third embodiment. The designated receiving node is preferably an edge receiving node, the sending node is preferably a base station, and the channel quality measurement result is preferably a CQI, as shown in fig. 3A, specifically including:
s301, the base station compares the wireless signal measurement value reported by each user equipment in the service group with the wireless signal measurement threshold value, and determines the user equipment with the lowest wireless signal measurement value in the user equipment lower than the wireless signal measurement threshold value as the edge user equipment.
The base station sets the wireless signal measurement threshold according to the coverage rate requirement, and the number of the user equipment of which the set wireless signal measurement threshold is required to be less than the wireless signal measurement threshold is equal to the number of the edge user equipment meeting the coverage rate requirement or the number of the edge user equipment multiplied by the number of the user equipment in a preset proportion.
Specifically, the process of determining the critical ue in this embodiment is described by taking a point-to-multipoint service as an example. It is assumed that currently, N UEs need to receive the point-to-multipoint service sent by the base station at the same time. And using the RSRP as a wireless signal measurement value. The method mainly comprises the following steps:
A. the base station determines an initial radio signal measurement threshold R _ th1 as its RSRP threshold.
B、UEiMeasuring self RSRPiAnd compared with a threshold value R _ th 1. If RSRPiR _ th1 ≦ R _ th, then UEiTransferring to cluster RRC _ CONNECTED state and transmitting RSRPiReporting to the eNB; if RSRPi>R _ th1, then UEiAnd transferring to a cluster RRC _ IDEL state.
C. And the base station determines the edge user equipment according to the RSRP value reported by the cluster RRC _ CONNECTED state UE.
D. If the cluster RRC _ CONNECTED UE exists, the base station makes the UE with the lowest RSRP value as the edge user equipment UEedgeAs shown in fig. 3B.
E. If there is no UE in the cluster RRC _ CONNECTED state, the base station needs to increase the RSRP threshold to R _ th2 until there is a UE in the cluster RRC _ CONNECTED state. The base station makes the UE with the lowest RSRP value be the edge user equipment UEedgeAs shown in fig. 3C.
S302, the base station indicates the edge user equipment to report CQI and HARQ feedback information.
When reporting the CQI, the edge user equipment can adopt periodic reporting or non-periodic reporting. When the CQI is periodically reported, the FDD frame may be configured in a configuration manner as shown in fig. 2E, the base station configures CQI-PMI-ConfigIndex with ICQI/PMI of 5 in the CQI-report periodic message, the period Npd of CQI reporting is 5 subframes, the period is shifted by NOFFSET, and the CQI is ICQI/PMI-2 of 3 subframes, so that the CQI reporting time may be denoted as TTI of 5 (n-1) +3, n is 1,2, ….
When reporting the CQI aperiodically, the TDD frame may be configured in a configuration manner as shown in fig. 2F, and the TDD uplink and downlink are configured to be 1, and when the UE receives the CSIrequest field in the DCI format0/4 indicating that the CQI needs to be reported in TTI 1,9, the UE may send aperiodic CQI information on the first available uplink subframe counted from subframe TTI +4, that is, on the PUSCH with TTI 7 and TTI 13.
S303, the base station inquires a mapping table among the CQI, the MCS and the modulation and coding mode according to the reported CQI, and determines the MCS corresponding to the CQI. For the convenience of the following description, the determined MCS corresponding to the CQI is marked as MCSfeedback。
S304, the base station adjusts the outer ring factor according to the HARQ feedback information.
The base station determines that the HARQ feedback information is an acknowledgement character ACK, and then an outer ring ascending step length is added on the basis of the outer ring factor; and the base station determines that the HARQ feedback information is a non-acknowledgement character NACK, and subtracts an outer ring descending step length on the basis of the outer ring factor. See the description above for example two.
S305, the base station adjusts the outer loop factor and the MCS according to the adjusted outer loop factorfeedbackAnd determining the modulation and coding mode of the service group.
See the description above for example two.
Example four
Fig. 4 is a schematic structural diagram of a link adaptive adjustment apparatus according to a fourth embodiment of the present invention, where the apparatus may be implemented in a software or hardware manner, and the apparatus is integrated in a sending node, and as shown in fig. 4, a specific structure of the apparatus is as follows: an indication reporting measurement result module 41 and a modulation and coding mode determining module 42.
The module 41 for indicating reporting measurement result is configured in the sending node, and is configured to indicate a designated receiving node in a service group to report a channel quality measurement result, where the service group includes at least one receiving node;
the modulation and coding scheme determining module 42 is configured in the sending node, and is configured to determine the modulation and coding scheme of the service group according to the channel quality measurement result.
The link adaptive adjustment device described in this embodiment is used to execute the link adaptive adjustment method described in each of the above embodiments, and the technical principle and the generated technical effect are similar, which are not described herein again.
On the basis of the above-described embodiments,
the device further comprises: an outer loop factor determination module 43.
The outer-loop factor determining module 43 is configured in the sending node, and is configured to determine an outer-loop factor according to a target block error rate, TargetBLER;
the modulation and coding scheme determining module 42 includes: an indication transmission feedback information unit 421 and a modulation and coding scheme determination unit 422.
The indication sending feedback information unit 421 is configured to indicate the designated receiving node to send HARQ feedback information;
the modulation and coding scheme determining unit 422 is configured to determine the modulation and coding scheme of the service group according to the channel quality measurement result, HARQ feedback information, and the outer loop factor.
On the basis of the foregoing embodiment, the modulation and coding scheme determining unit 422 is specifically configured to determine that the HARQ feedback information is an acknowledgement character ACK, and then add an outer loop ascending step length on the basis of the outer loop factor; determining a modulation and coding mode of the appointed receiving node according to the increased outer ring factor and the channel quality measurement result; or, if the HARQ feedback information is determined to be a non-acknowledgement character NACK, subtracting an outer ring descending step length on the basis of the outer ring factor; and determining the modulation and coding mode of the appointed receiving node according to the subtracted outer ring factor and the channel quality measurement result.
On the basis of the above embodiment, the outer ring ascending step length and the outer ring descending step length are targetbller (1-targetbller).
On the basis of the foregoing embodiment, the modulation and coding scheme determining module 42 is specifically configured to determine the modulation and coding scheme of the service group according to a pre-established channel quality measurement result, a mapping table between a relative value MCS characterizing the modulation and coding scheme and the modulation and coding scheme.
On the basis of the foregoing embodiment, the modulation and coding scheme determining module 42 is specifically configured to form a channel quality measurement result set with a plurality of channel quality measurement results when the designated receiving node is multiple and the corresponding channel quality measurement results are multiple, and select one channel quality measurement result from the set as the channel quality measurement result of the service group; and determining the modulation and coding mode of the service group according to the channel quality measurement result of the service group.
On the basis of the above embodiment, the channel quality measurement result is a channel indicator characterizing a link state.
On the basis of the above embodiments, the channel indicator includes a channel quality indicator CQI and/or an indicator characterizing channel space information.
On the basis of the foregoing embodiment, the indicator characterizing the channel space information includes at least one of: rank indicator RI, precoding matrix indicator PMI and altitude indicator AI.
On the basis of the above embodiment, the designated receiving node is a critical receiving node;
the device further comprises: a critical user determination module 44.
The critical subscriber determining module 44 is configured in the sending node, and configured to determine a critical receiving node according to the measured value of the wireless signal reported by each receiving node in the service group.
On the basis of the foregoing embodiment, the critical subscriber determining module 44 is specifically configured to compare a radio signal measurement value reported by each receiving node in the service group with a radio signal measurement threshold value, and determine a receiving node lower than the radio signal measurement threshold value as a critical receiving node.
On the basis of the above embodiment, the designated receiving node is an edge receiving node;
the device further comprises: edge user determination module 45.
The edge user determining module 45 is configured in the sending node, and is configured to determine an edge receiving node according to a wireless signal measurement value reported by each receiving node in the service group.
On the basis of the foregoing embodiment, the edge user determining module 45 is specifically configured to compare the radio signal measurement value reported by each receiving node in the service group with a radio signal measurement threshold value, and determine a receiving node with the lowest radio signal measurement value among the receiving nodes lower than the radio signal measurement threshold value as an edge receiving node.
On the basis of the above embodiment, the apparatus further includes: a threshold value determination module 46.
The threshold determining module 46 is configured in the sending node, and is configured to set a wireless signal measurement threshold according to the coverage requirement, so that the number of receiving nodes lower than the wireless signal measurement threshold is equal to the number of edge receiving nodes meeting the coverage requirement or the number of receiving nodes obtained by multiplying the number of edge receiving nodes by a preset ratio.
The link adaptive adjustment device described in each of the above embodiments is configured to execute the link adaptive adjustment method described in each of the above embodiments, and the technical principle and the generated technical effect are similar, and are not described again here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (28)
1. A link adaptive adjustment method is characterized by comprising the following steps:
the sending node indicates the appointed receiving node in the service group to report the channel quality measuring result;
and the transmitting node determines the modulation and coding mode of a service group according to the channel quality measurement result, wherein the service group comprises at least one receiving node.
2. The method of claim 1, further comprising:
the sending node determines an outer ring factor according to a target block error rate TargetBLER;
the step of determining, by the sending node, a modulation and coding mode of the service group according to the channel quality measurement result includes:
the sending node instructs the appointed receiving node to send hybrid automatic repeat request (HARQ) feedback information;
and the transmitting node determines the modulation and coding mode of the service group according to the channel quality measurement result, the HARQ feedback information and the outer ring factor.
3. The method of claim 2, wherein the determining, by the sending node, the modulation and coding scheme of the designated receiving node according to the channel quality measurement result, HARQ feedback information, and an outer loop factor comprises:
if the sending node determines that the HARQ feedback information is an acknowledgement character ACK, an outer ring ascending step length is added on the basis of the outer ring factor;
the sending node determines the modulation and coding mode of the service group according to the increased outer ring factor and the channel quality measurement result;
or,
the sending node determines that the HARQ feedback information is a non-acknowledgement character NACK, and then subtracts an outer ring descending step length on the basis of the outer ring factor;
and the transmitting node determines the modulation and coding mode of the service group according to the subtracted outer ring factor and the channel quality measurement result.
4. The method of claim 3, wherein the ratio of the outer ring up step size to the outer ring down step size is TargetBLER: (1-TargetBLER).
5. The method according to any of claims 1 to 4, wherein the determining, by the sending node, the modulation and coding scheme of the service group according to the channel quality measurement result comprises:
and the transmitting node determines the modulation and coding mode of the service group according to a pre-established channel quality measurement result, a mapping table between a relative value MCS representing the modulation and coding mode and the modulation and coding mode.
6. The method according to any of claims 1 to 4, wherein the determining, by the sending node, the modulation and coding scheme of the service group according to the channel quality measurement result comprises:
when the designated receiving node is multiple and the corresponding channel quality measurement results are multiple, the sending node forms a channel quality measurement result set by the multiple channel quality measurement results, and selects one channel quality measurement result from the set as the channel quality measurement result of the service group;
and the transmitting node determines the modulation and coding mode of the service group according to the channel quality measurement result of the service group.
7. The method of claim 6, wherein the channel quality measurement is a channel indicator characterizing a link state.
8. The method according to claim 7, wherein the channel indicator comprises a Channel Quality Indicator (CQI) and/or an indicator characterizing channel spatial information.
9. The method of claim 8, wherein the indicator characterizing the channel space information comprises at least one of: rank indicator RI, precoding matrix indicator PMI and altitude indicator AI.
10. The method according to any one of claims 1 to 4 and 7 to 9, wherein the designated receiving node is a critical receiving node;
the method further comprises the following steps:
and the transmitting node determines a critical receiving node according to the wireless signal measurement value reported by each receiving node in the service group.
11. The method of claim 10, wherein the determining, by the sending node, a critical receiving node according to the measured values of the wireless signals reported by the receiving nodes in the service group comprises:
and the transmitting node compares the wireless signal measurement value reported by each receiving node in the service group with a wireless signal measurement threshold value, and determines the receiving node lower than the wireless signal measurement threshold value as a critical receiving node.
12. The method according to any one of claims 1 to 4 and 7 to 9, wherein the designated receiving node is an edge receiving node;
the method further comprises the following steps:
and the transmitting node determines edge receiving nodes according to the wireless signal measurement values reported by all the receiving nodes in the service group.
13. The method of claim 12, wherein the determining, by the sending node, an edge receiving node according to the measured values of the wireless signals reported by the receiving nodes in the service group comprises:
and the transmitting node compares the wireless signal measurement value reported by each receiving node in the service group with a wireless signal measurement threshold value, and determines the receiving node with the lowest wireless signal measurement value in the receiving nodes lower than the wireless signal measurement threshold value as an edge receiving node.
14. The method of claim 11 or 13, further comprising:
the sending node sets a wireless signal measurement threshold value according to the coverage rate requirement, so that the number of receiving nodes lower than the wireless signal measurement threshold value is equal to the number of edge receiving nodes meeting the coverage rate requirement or the number of receiving nodes obtained by multiplying the number of edge receiving nodes by a preset proportion.
15. A link adaptive adjustment apparatus, comprising:
an indication reporting measurement result module configured in the sending node, for indicating a designated receiving node in a service group to report a channel quality measurement result, wherein the service group comprises at least one receiving node;
and the modulation and coding mode determining module is configured in the sending node and is used for determining the modulation and coding mode of the service group according to the channel quality measurement result.
16. The apparatus of claim 15, further comprising:
the outer ring factor determining module is configured in the sending node and used for determining an outer ring factor according to the target block error rate TargetBLER;
the modulation and coding mode determining module comprises:
an indication sending feedback information unit, configured to indicate the designated receiving node to send HARQ feedback information;
and a modulation and coding mode determining unit, configured to determine a modulation and coding mode of the service group according to the channel quality measurement result, HARQ feedback information, and the outer loop factor.
17. The apparatus according to claim 16, wherein the modulation and coding scheme determining unit is specifically configured to:
determining that the HARQ feedback information is an acknowledgement character ACK, and adding an outer ring ascending step length on the basis of the outer ring factor;
determining the modulation and coding mode of the service group according to the increased outer ring factor and the channel quality measurement result;
or,
if the HARQ feedback information is determined to be a non-acknowledgement character NACK, subtracting an outer ring descending step length on the basis of the outer ring factor;
and determining the modulation and coding mode of the service group according to the subtracted outer ring factor and the channel quality measurement result.
18. The apparatus of claim 17, wherein a ratio of the outer ring up step size to the outer ring down step size is TargetBLER: (1-TargetBLER).
19. The apparatus according to any one of claims 15 to 18, wherein the modulation and coding scheme determining module is specifically configured to:
and determining the modulation and coding mode of the service group according to a pre-established channel quality measurement result, a mapping table between a relative value MCS representing the modulation and coding mode and the modulation and coding mode.
20. The apparatus according to any one of claims 15 to 18, wherein the modulation and coding scheme determining module is specifically configured to:
when the designated receiving nodes are multiple and the corresponding channel quality measurement results are multiple, forming a channel quality measurement result set by the multiple channel quality measurement results, and selecting one channel quality measurement result from the set as the channel quality measurement result of the service group;
and determining the modulation and coding mode of the service group according to the channel quality measurement result of the service group.
21. The apparatus of claim 20, wherein the channel quality measurement is a channel indicator characterizing a link state.
22. The apparatus of claim 21, wherein the channel indicator comprises a Channel Quality Indicator (CQI) and/or an indicator characterizing channel space information.
23. The apparatus of claim 22, wherein the indicator characterizing the channel space information comprises at least one of: rank indicator RI, precoding matrix indicator PMI and altitude indicator AI.
24. The apparatus according to any one of claims 15 to 18 and 21 to 23, wherein the designated receiving node is a critical receiving node;
the device further comprises:
and the critical user determining module is configured in the sending node and used for determining the critical receiving node according to the wireless signal measurement value reported by each receiving node in the service group.
25. The apparatus according to claim 24, wherein the critical subscriber determination module is specifically configured to:
and comparing the wireless signal measurement value reported by each receiving node in the service group with a wireless signal measurement threshold value, and determining the receiving node lower than the wireless signal measurement threshold value as a critical receiving node.
26. The apparatus according to any one of claims 15 to 18 and 21 to 23, wherein the designated receiving node is an edge receiving node;
the device further comprises:
and the edge user determining module is configured in the sending node and used for determining the edge receiving node according to the wireless signal measurement value reported by each receiving node in the service group.
27. The apparatus of claim 26, wherein the edge user determination module is specifically configured to:
and comparing the wireless signal measurement value reported by each receiving node in the service group with a wireless signal measurement threshold value, and determining the receiving node with the lowest wireless signal measurement value in the receiving nodes lower than the wireless signal measurement threshold value as an edge receiving node.
28. The apparatus of claim 25 or 27, further comprising:
and the threshold value determining module is configured in the sending node and used for setting a wireless signal measurement threshold value according to the coverage rate requirement, so that the number of receiving nodes lower than the wireless signal measurement threshold value is equal to the number of edge receiving nodes meeting the coverage rate requirement or the number of receiving nodes obtained by multiplying the number of edge receiving nodes by a preset proportion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610280433.6A CN107342839A (en) | 2016-04-29 | 2016-04-29 | Link circuit self-adapting method of adjustment and device |
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| CN201610280433.6A CN107342839A (en) | 2016-04-29 | 2016-04-29 | Link circuit self-adapting method of adjustment and device |
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