CN102395163B - The exchange method and cooperative multicast system of information in cooperative multicast system - Google Patents
The exchange method and cooperative multicast system of information in cooperative multicast system Download PDFInfo
- Publication number
- CN102395163B CN102395163B CN201110182414.7A CN201110182414A CN102395163B CN 102395163 B CN102395163 B CN 102395163B CN 201110182414 A CN201110182414 A CN 201110182414A CN 102395163 B CN102395163 B CN 102395163B
- Authority
- CN
- China
- Prior art keywords
- resource
- base station
- message
- uplink
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000003993 interaction Effects 0.000 claims description 9
- 230000009897 systematic effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 14
- 125000004122 cyclic group Chemical group 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 108010076504 Protein Sorting Signals Proteins 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 102100029516 Basic salivary proline-rich protein 1 Human genes 0.000 description 1
- 101001125486 Homo sapiens Basic salivary proline-rich protein 1 Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- GVVPGTZRZFNKDS-JXMROGBWSA-N geranyl diphosphate Chemical compound CC(C)=CCC\C(C)=C\CO[P@](O)(=O)OP(O)(O)=O GVVPGTZRZFNKDS-JXMROGBWSA-N 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses the exchange method of information in a kind of cooperative multipoint transmission (CoMP) system and CoMP system, this method comprises the following steps：Base station sends message to the base station of cell adjacent thereto, wherein, the message includes up DMRS resource occupation information；Receive the base station of the message and the scheduling strategy of this cell and/or resource for sending up DMRS are determined according to up DMRS resource occupation information.By present invention reduces the interference of cooperation cell, improving systematic function.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to an information interaction method in a Coordinated Multi-point transmission and Reception (CoMP) system and a CoMP system.
Background
In a Long Term Evolution (LTE) system of The third Generation Partnership Project (3 GPP), a base station centralized scheduling method is used to control transmission of a Physical Uplink Shared Channel (PUSCH) of a User Equipment (UE).
Uplink Scheduling Information (Uplink Scheduling Information) for the PUSCH is sent to the target UE by the base station through a Physical Downlink Control Channel (PDCCH for short). The uplink scheduling information includes: control information such as resource allocation, modulation and coding scheme, and Cyclic Shift (Cyclic Shift) of Demodulation Reference Signal (DMRS) related to the physical uplink shared channel.
In the LTE system, a physical uplink shared channel adopts single antenna port transmission. One system frame (frame) contains 10 subframes (subframes), each containing 2 slots (slots). Fig. 1 is a diagram illustrating a cyclic prefix in a slot according to the related art, as shown in fig. 1, for a Normal cyclic prefix (normalccp), each slot is composed of 6 data symbols and 1 demodulation reference signal; for an Extended cyclic prefix (Extended CP), each slot consists of 5 data symbols and 1 demodulation reference signal.
The demodulation reference signal DM RS is composed of a sequence in the frequency domain, which is a cyclic shift of the reference signal sequence. In order to randomize inter-cell interference, a reference signal Sequence of a demodulation reference signal may implement Sequence hopping (Sequence hopping) or Sequence Group hopping (Group hopping) based on a time slot according to a base station configuration, which is also called an SGH method of time slot hopping. That is, according to the base station configuration, the demodulation reference signals of a ue on two slots in a subframe are different and vary with the slots in a system frame according to a certain hopping pattern.
In time slot nsIn the above embodiments, the cyclic shift amount α of the demodulation reference signal is α ═ 2 π ncsAnd/12, wherein,within a radio frame, ns＝0，1，...，19；Is configured by the parameters of the higher layer,configured by uplink scheduling information. n isPRS(ns) Generated by a pseudo-random generator, particularly denoted as
The uplink scheduling Information is carried in a physical downlink control channel, and is sent to the target ue from the base station in a certain downlink control Information format (DCI format). In the LTE system, the formats of downlink control information are divided into the following: DCI format 0, 1A, 1B, 1C, 1D, 2A, 3A, and the like, where DCI format 0 includes uplink scheduling information for indicating scheduling of a physical uplink shared channel PUSCH.
An LTE-Advanced system (LTE-a system for short) is a next-generation evolution system of the LTE system. In the LTE-a system, the physical uplink shared channel may be transmitted through a single antenna port or through multiple antenna ports. Fig. 2 is a schematic diagram of baseband processing at a transmitting end of a physical uplink shared channel transmitted by using multiple antenna ports in an LTE-a system according to the related art, where as shown in fig. 2, the LTE-a system supports spatial multiplexing based on one or two Codewords (CW), and each Codeword corresponds to a Transport Block (TB). The codewords are further mapped to layers (layers), each codeword being mapped to one or two layers of data.
Fig. 3 is a schematic diagram of Precoding of an LTE-a system according to the related art, as shown in fig. 3, the LTE-a employs a Codebook (Codebook) -based linear Precoding technique (Precoding), which is a technique for improving performance of a multi-antenna system by preprocessing a signal at a transmitting end using Channel State Information (CSI). One way for the transmitting end to obtain the CSI is through feedback from the receiving end. In order to reduce the feedback overhead, the common approach is to store the same codebook at the receiving end and the transmitting end. The receiving end selects a proper Precoding Matrix in the codebook according to the current channel condition, and feeds back an Index value (Precoding Matrix Index, PMI for short) of the proper Precoding Matrix in the set to the transmitting end, and the transmitting end finds the Precoding Matrix according to the fed-back Precoding Matrix Index and precodes the transmitted signal. The mathematical model of data precoding is that y is HWs + n, where y is the received signal vector, H is the channel coefficient matrix, W is the precoding matrix, s is the signal vector, and n is the noise vector.
In the LTE-a system, when a physical uplink shared channel is transmitted using multiple antenna ports, demodulation reference signals (DMRSs) of data of each layer are precoded in the same way as the data of each layer. And the demodulation reference signals of different layer data, including the demodulation reference signals of multi-layer data of the same user equipment in a single-user multiple-input multiple-output system (SU-MIMO) and the demodulation reference signals of multi-layer data of a plurality of user equipments in a multi-user multiple-input multiple-output system (MU-MIMO), are orthogonalized by using different demodulation reference signal Cyclic Shifts (CS) and/or Orthogonal masks (OCC) to distinguish different layer data spatially multiplexed by users or different users. Wherein the orthogonal mask OCC isAnd and the demodulation reference signals act on two time slots (slots) in one Subframe (Subframe).
Currently, in the standard Release established by 3GPP, the LTE standard Release is Release 8 (Release 8) and Release 9 (Release 9), the LTE-a standard Release is Release 10 (Release 10), which is abbreviated as Release-8, Release-9 and Release-10, respectively, and the LTE-a standard may also include subsequent releases, such as Release-11. In the current Rel-10 release, the base station may indicate cyclic shift/OCC information of the demodulation reference signal for the scheduled PUSCH through DCIformat 0 and DCI format 4, as shown in table 1.
TABLE 1 Cyclic Shift regions of uplink-related DCI FormatAnd [ w (λ) (0) w (λ) (1)]Mapping table
When orthogonalizing the demodulation reference signals using the orthogonal mask OCC, the base station needs to jointly detect the demodulation reference signals on two slots in one subframe, and thus requires that the demodulation reference signals on two slots in one subframe are the same for one ue. In this case, the SGH scheme of slot hopping in the LTE system cannot be used. However, in order to randomize inter-cell interference as much as possible, an SGH scheme for subframe hopping is proposed in the related art. That is, according to the base station configuration, the demodulation reference signals of a ue in two slots in a subframe are the same, the demodulation reference signals in each subframe in a system frame are different, and the demodulation reference signals vary from subframe to subframe in a system frame according to a certain hopping pattern.
The coordinated multi-point transmission technology realizes higher capacity and reliable transmission of a wireless link at the edge of a cell by utilizing the coordinated transmission of transmitting antennas of a plurality of cells, and can effectively solve the problem of cell edge interference. Fig. 4 is a schematic diagram of downlink coordinated multipoint transmission according to the related art, and as shown in fig. 4, downlink CoMP can be divided into two types: joint processing/Joint Transmission (JP/JT for short) and coordinated scheduling/Beamforming (CS/CB for short). In JT, data is transmitted simultaneously from multiple cells, and the transmit data, scheduling, and channel state information are only interacted between multiple transmission points in the cooperating set; in CS/CB, only the serving cell sends data to the UE, and scheduling and Beamforming information interact in the CoMP coordination set. Different cells participating in transmission or cooperation form a cooperation set, and for a certain UE, 1 cell in the cooperation set is a serving cell, and the rest cells are cooperation cells.
Fig. 5 is a schematic diagram of uplink coordinated multi-point transmission according to the related art, and as shown in fig. 5, a UE1 sends data to a serving cell and a base station of a coordinated cell, and the base station of the coordinated cell sends the received data to the base station of the serving cell to which the UE1 belongs through an X2 interface for combined reception processing. When the uplink DMRSs of the UE2 and/or the UE3 and the uplink DMRSs of the UE1 overlap in a frequency domain, the uplink DMRSs of the UE1 may be interfered by the UE2 and/or the UE3, so that the channel estimation quality of the UE1 by the receiving end is affected, and the transmission performance of the uplink CoMP is reduced.
Aiming at the problem of how to improve the channel estimation quality of a receiving end to an uplink CoMP user in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The main objective of the present invention is to provide an interactive scheme for messages in a coordinated multi-point transmission system, so as to at least solve the problem in the related art that the channel estimation quality of a receiving end to an uplink CoMP user is low.
In order to achieve the above object, according to an aspect of the present invention, there is provided an interaction method of information in a CoMP system.
The information interaction method in the CoMP system comprises the following steps: the base station sends a message to a base station of a cell adjacent to the base station, wherein the message comprises resource occupation information of an uplink DMRS; and the base station receiving the message determines the scheduling strategy of the cell and/or the resource for transmitting the uplink DMRS according to the resource occupation information of the uplink DMRS.
Preferably, the message is a load information message or a message for exchanging CoMP information.
Preferably, the resource occupation information of the uplink DMRS is resource occupation information of the uplink CoMP DMRS.
Preferably, the scheduling policy is that the base station receiving the message does not schedule the users at the edge of the cell on the PRB corresponding to the resource occupancy information of the uplink DMRS.
Preferably, the resource used for transmitting the uplink DMRS is a resource that does not overlap with a resource indicated by the resource occupancy information of the uplink DMRS, and the non-overlapping resource includes at least one of: code domain resources, time domain resources, frequency domain resources; the non-overlapping resource is a code domain resource, which means that a base station receiving the message uses an OCC different from the OCC indicated by the resource occupation information of the uplink DMRS; the non-overlapping resource is a time domain resource, which means that a base station receiving the message selects a time domain resource different from a time domain resource corresponding to the resource occupation information of the uplink DMRS; the non-overlapping resource is a frequency domain resource, which means that a base station receiving the message selects a frequency domain resource different from a frequency domain resource corresponding to the resource occupation information of the uplink DMRS.
Preferably, before the base station sends the message to the base stations of the neighboring cells, the method further includes: and setting an OCC occupation indication information element of the uplink DMRS through a message of an X2 interface to express resource occupation information of the uplink DMRS.
Preferably, the step of setting an OCC occupation indication information element of the uplink DMRS through a message of an X2 interface to indicate resource occupation information of the uplink DMRS includes: bit characters are adopted to represent OCC occupation information on each PRB, wherein each bit corresponds to one PRB, and 0 and 1 respectively represent that different OCCs are used on each bit; or, an enumeration character is used for representing OCC occupation information on each PRB and/or information whether an uplink CoMP DMRS exists, wherein different enumeration values use different OCCs and/or represent whether the uplink CoMP DMRS exists.
Preferably, the sending the message to the base station of the neighboring cell by the base station comprises: the base station of each cell in the cooperation set sends a message to the base station of the cell cooperating with the base station; alternatively, the base station of the serving cell transmits the message of the serving cell to the base stations of other cells in the coordinated set.
To achieve the above object, according to another aspect of the present invention, a CoMP system is also provided.
The CoMP system according to the present invention includes a plurality of base stations, wherein each of the plurality of base stations includes: the sending module is used for sending a message to a base station of a cell adjacent to the sending module, wherein the message comprises resource occupation information of an uplink DMRS; a receiving module, configured to receive a message from a base station of an adjacent cell; and the determining module is used for determining the scheduling strategy of the cell and/or the resource for transmitting the uplink DMRS according to the resource occupation information of the uplink DMRS.
Preferably, each of the plurality of base stations further comprises: and the setting module is used for setting an OCC (orthogonal code control) occupation indication information element of the uplink DMRS through the information of the X2 interface to express the resource occupation information of the uplink DMRS.
Preferably, the setting module is further configured to use bit characters to represent OCC occupation information on each PRB, where each bit corresponds to one PRB, and on each bit, 0 and 1 respectively represent that different OCCs are used; or, an enumeration character is used for representing OCC occupation information on each PRB and/or information whether an uplink CoMP DMRS exists, wherein different enumeration values use different OCCs and/or represent whether the uplink CoMP DMRS exists.
According to the invention, the base station sends the message comprising the resource occupation information of the uplink DMRS to the base station of the adjacent cell, and the base station receiving the message determines the scheduling strategy of the cell and/or the mode for sending the resource of the uplink DMRS according to the resource occupation information of the uplink DMRS, so that the problem of low channel estimation quality of a receiving end to an uplink CoMP user in the related technology is solved, the interference of a cooperative cell is reduced, and the system performance is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a diagram of a cyclic prefix in one slot according to the related art;
fig. 2 is a schematic diagram of transmit side baseband signal processing of a physical uplink shared channel transmitted using multiple antenna ports according to a related art LTE-a system;
fig. 3 is a diagram of precoding of an LTE-a system according to the related art;
fig. 4 is a schematic diagram of downlink coordinated multipoint transmission according to the related art;
fig. 5 is a schematic diagram of uplink coordinated multipoint transmission according to the related art;
fig. 6 is a flowchart of an interaction method of information in a CoMP system according to an embodiment of the present invention;
fig. 7 is a block diagram of a CoMP system according to an embodiment of the present invention;
fig. 8 is a block diagram of a CoMP system according to a preferred embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
According to the embodiment of the invention, an information interaction method in a CoMP system is provided. Fig. 6 is a flowchart of an information interaction method in a CoMP system according to an embodiment of the present invention, as shown in fig. 6, including the following steps:
step S602, a base station sends a message to a base station of a cell adjacent to the base station, wherein the message comprises resource occupation information of an uplink demodulation reference signal DMRS;
step S604, the base station receiving the message determines the scheduling strategy of the cell and/or the resource for transmitting the uplink DMRS according to the resource occupation information of the uplink DMRS.
Through the steps, the base station sends the message comprising the resource occupation information of the uplink DMRS to the base station of the adjacent cell, and the base station receiving the message determines the scheduling strategy of the cell and/or the mode for sending the resource of the uplink DMRS according to the resource occupation information of the uplink DMRS, so that the problem of low channel estimation quality of a receiving end to an uplink CoMP user in the related technology is solved, the interference of a cooperative cell is reduced, and the system performance is improved.
Preferably, the message is a load information message or a message for exchanging CoMP information. The method is simple to implement and high in operability.
Preferably, the resource occupation information of the uplink DMRS is resource occupation information of the uplink CoMP DMRS.
Preferably, the scheduling policy is that the base station receiving the message does not schedule the user at the edge of the cell on a Physical Resource Block (PRB) corresponding to the Resource occupancy information of the uplink DMRS.
Preferably, in step S604, the resource used for transmitting the uplink DMRS is a resource that does not overlap with the resource indicated by the resource occupancy information of the uplink DMRS, and the non-overlapping resource includes at least one of: code domain resources, time domain resources, frequency domain resources; the non-overlapping resource is a code domain resource, which means that a base station receiving the message uses an Orthogonal Code Channel (OCC) different from an OCC indicated by resource occupation information of the uplink DMRS; the non-overlapping resource is a time domain resource, which means that a base station receiving the message selects a time domain resource different from a time domain resource corresponding to the resource occupation information of the uplink DMRS; the non-overlapping resource is a frequency domain resource, which means that a base station receiving the message selects a frequency domain resource different from a frequency domain resource corresponding to the resource occupation information of the uplink DMRS.
Preferably, before step S602, the message via the X2 interface sets an OCC occupancy indication information element of the uplink DMRS to indicate resource occupancy information of the uplink DMRS. The method is simple and practical and has strong operability.
Preferably, the message of the X2 interface setting the OCC occupation indication information element of the uplink DMRS to indicate the resource occupation information of the uplink DMRS includes: bit characters are adopted to represent OCC occupation information on each PRB, wherein each bit corresponds to one PRB, and 0 and 1 respectively represent that different OCCs are used on each bit; or, an enumeration character is used for representing OCC occupation information on each PRB and/or information whether an uplink CoMP DMRS exists, wherein different enumeration values use different OCCs and/or represent whether the uplink CoMP DMRS exists. The method can improve the accuracy and efficiency of the system.
Preferably, in step S602, the base station of each cell in the cooperation set sends the message to the base station of the cell cooperating therewith; alternatively, the base station of the serving cell transmits the message of the serving cell to the base stations of other cells in the coordinated set. The method can improve the flexibility of the system.
Corresponding to the method, a CoMP system is also provided. Fig. 7 is a block diagram of a CoMP system according to an embodiment of the present invention, and as shown in fig. 7, the CoMP system includes a plurality of base stations 72, wherein each of the plurality of base stations 72 includes: a sending module 722, configured to send a message to a base station of a cell adjacent to the sending module, where the message includes resource occupation information of an uplink DMRS; a receiving module 724 for receiving the message from the base station of the neighboring cell; a determining module 726, coupled to the receiving module 724, configured to determine a scheduling policy of the cell and/or resources used for transmitting the uplink DMRS according to the resource occupancy information of the uplink DMRS.
Through the CoMP system, the sending module 722 sends a message including the resource occupation information of the uplink DMRS to the base station of the neighboring cell, and the determining module 726 of the base station that receives the message determines the scheduling policy of the cell and/or the manner for sending the resource of the uplink DMRS according to the resource occupation information of the uplink DMRS, thereby solving the problem of low channel estimation quality of the receiving end to the uplink CoMP user in the related art, reducing interference of the cooperative cell, and improving system performance.
Preferably, the resource occupation information of the uplink DMRS may be resource occupation information of the uplink CoMP DMRS.
Fig. 8 is a block diagram of a CoMP system according to a preferred embodiment of the present invention, and as shown in fig. 8, each of the plurality of base stations 72 further includes: a setting module 728, coupled to the sending module 722, configured to set an OCC occupation indication information element of the uplink DMRS through a message of the X2 interface to indicate resource occupation information of the uplink DMRS.
Preferably, the setting module 728 is further configured to use bit characters to represent OCC occupation information on each PRB, where each bit corresponds to one PRB, and on each bit, 0 and 1 respectively represent that different OCCs are used; or, an enumeration character is used for representing OCC occupation information on each PRB and/or information whether an uplink CoMP DMRS exists, wherein different enumeration values use different OCCs and/or represent whether the uplink CoMP DMRS exists.
The implementation of the above embodiments will be described in detail below with reference to the preferred embodiments and the accompanying drawings.
Example one
The embodiment provides an interference coordination method for uplink demodulation reference signals in a cell in a CoMP system, which reduces interference from a coordinated cell by interacting resource occupation information of an uplink CoMP DMRS, improves channel estimation quality of a receiving end (base station) on the uplink DMRS, and further improves transmission performance of the uplink CoMP.
The interference coordination method for the inter-cell uplink demodulation reference signal in the CoMP system in this embodiment may be: first, a base station sends a message (for example, the message may be a LOAD INFORMATION (LOAD INFORMATION) message or a message for CoMP-related INFORMATION interaction) to a base station of an adjacent cell, where the message includes resource occupation INFORMATION of an uplink CoMP DMRS; secondly, the base station receiving the message determines the scheduling strategy of the cell according to the received resource occupation information of the uplink CoMP DMRS (that is, when the base station receives the uplink CoMP resource occupation information, the base station avoids scheduling users at the edge of the cell on the corresponding PRB as much as possible) and/or resources for transmitting the uplink DMRS.
In an implementation process, the interference coordination method may include the following steps:
step 1, in a CoMP system, a base station of each cell in a coordinated set sends resource occupation information of an uplink CoMP DMRS to a base station of a coordinated cell.
Preferably, each cell in the coordinated set represents resource occupation information of the uplink CoMP DMRSs through an Information Element (IE) on an X2 interface, where the OCC occupation indication of the uplink DMRSs is indicated. The INFORMATION Element (IE) entry indicates OCC occupancy of the uplink DMRS, and is an IE entry set in a LOAD INFORMATION message (LOAD INFORMATION message) and indicates OCC occupancy INFORMATION on each PRB.
For example, the IE format adopted by the IE entry may be as follows: in the first mode, each bit in the bit character corresponds to 1 PRB, that is, the 1 st bit corresponds to PRB0, the 2 nd bit corresponds to PRB1, and so on. Each bit in the bit word indicates the use of OCC [1-1] if the value is "1", the value "0" indicates the use of OCC [11 ", or the value" 0 ", the value OCC [1-1], the value" 1 "indicates the use of OCC [11], as shown in Table 2 below.
Table 2 OCC physical resource block occupation indication 1 of uplink CoMP DMRS
And in the second mode, enumeration characters are adopted to represent OCC occupation information on each PRB and/or information whether uplink CoMPDMRS exists. Suppose that the corresponding 2bits of the ith PRB (i is more than or equal to 1 and less than or equal to 110) is bi1bi0. If b isi1bi0When the current resource block is 00, no uplink CoMP DMRS exists on the ith PRB; if b isi1bi0When the value is 01, the uplink CoMP DMRS is present on the ith PRB, and the OCC [11] is used](ii) a If b isi1bi0When the value is 10, the uplink CoMP DMRS is on the ith PRB, and OCC [1-1] is used](ii) a The IE format that may be added to the X2 interface is shown in table 3 below:
table 3 OCC physical resource block occupation indication 2 of uplink CoMP DMRS
And 2, each base station determines the resource for transmitting the uplink DMRS in the cell according to the received resource occupation information.
Preferably, the base station selects a resource which does not overlap with the resource indicated by the resource occupancy information of the CoMP DMRS as the resource for transmitting the uplink DMRS. Wherein the non-overlapping of resources comprises: the code domain resources do not overlap, and/or the time domain resources do not overlap, and/or the frequency domain resources do not overlap.
Preferably, the non-overlapping of the code domain resources of the uplink DMRS includes: and using OCC different from that indicated by the uplink CoMP DMRS resource occupation information.
Preferably, the non-overlapping of the time domain resources of the uplink DMRS includes: selecting time domain resources corresponding to the uplink CoMP DMRS resource occupation information; or, not scheduling the user on the time domain resource corresponding to the uplink CoMP DMRS resource occupation information.
Preferably, the non-overlapping of the frequency domain resources of the uplink DMRS includes: and selecting frequency domain resources corresponding to the uplink CoMP DMRS resource occupation information.
In the implementation process, the resource for transmitting the uplink DMRS in the cell may be selected according to the following rule:
(1) and selecting the OCC different from the OCC used by the users in the cooperative cell as the OCC of the uplink users in the service cell. In addition, the serving cell also sends resource occupation information of the uplink DMRS of the serving cell to other cells in the coordinated set through an X2 interface.
(2) And selecting time domain resources different from the time domain resources used by the users in the cooperative cell as the time domain resources of the uplink users in the serving cell.
(3) And selecting frequency domain resources different from those used by the users in the cooperative cell as the frequency domain resources of the uplink users in the serving cell.
In summary, by the method for coordinating interference of uplink demodulation reference signals in a CoMP system according to the embodiment of the present invention, parameters of the demodulation reference signals can be indicated to meet the requirement of uplink multi-antenna port transmission, so that the problem that the indication method in the related art cannot meet the requirement of uplink multi-antenna port transmission is solved, the interference of a coordinated cell is reduced, and the system performance is improved.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or they may be separately fabricated into various integrated circuit modules, or multiple modules or steps thereof may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An information interaction method in a coordinated multi-point transmission (CoMP) system is characterized by comprising the following steps:
the base station sends a message to a base station of a cell adjacent to the base station, wherein the message comprises resource occupation information of an uplink demodulation reference signal (DMRS);
the base station receiving the message determines a scheduling strategy of the cell and/or resources for transmitting the uplink DMRS according to the resource occupation information of the uplink DMRS;
wherein the sending the message to the base station of the cell adjacent to the base station comprises: the base station of each cell in the cooperation set sends the message to the base station of the cell cooperating with the base station; or, the base station of the local serving cell sends the message of the local cell to the base stations of other cells in the cooperation set;
the scheduling strategy is that the base station receiving the message does not schedule users at the edge of the cell on a physical resource block PRB corresponding to the resource occupation information of the uplink DMRS, and the resource used for sending the uplink DMRS is a resource which does not overlap with the resource indicated by the resource occupation information of the uplink DMRS.
2. The method of claim 1, wherein the message is a load information message or a message for exchanging CoMP information.
3. The method of claim 1, wherein the resource occupancy information for the uplink DMRS is resource occupancy information for an uplink CoMPDMRS.
4. The method of claim 1,
the non-overlapping resources include at least one of: code domain resources, time domain resources, frequency domain resources;
wherein, the non-overlapping resource is a code domain resource, which means that the base station receiving the message uses an orthogonal code (OCC) different from an OCC indicated by the resource occupation information of the uplink DMRS;
the non-overlapping resource is a time domain resource, which means that the base station receiving the message selects a time domain resource different from the time domain resource corresponding to the resource occupation information of the uplink DMRS;
the non-overlapping resource is a frequency domain resource, which means that the base station receiving the message selects a frequency domain resource different from the frequency domain resource corresponding to the resource occupation information of the uplink DMRS.
5. The method according to any of claims 1 to 4, wherein before the base station sends the message to the base stations of its neighboring cells, the method further comprises:
and setting an OCC occupation indication information element of the uplink DMRS through the message of the X2 interface to express the resource occupation information of the uplink DMRS.
6. The method of claim 5, wherein the setting, by the message of the X2 interface, an OCC occupancy indication information element of the uplink DMRS to represent resource occupancy information of the uplink DMRS comprises:
bit characters are adopted to represent OCC occupation information on each PRB, wherein each bit corresponds to one PRB, and 0 and 1 respectively represent that different OCCs are used on each bit; or,
and adopting enumeration characters to represent OCC occupation information on each PRB and/or information of whether uplink CoMP DMRS exists, wherein different enumeration values use different OCCs and/or represent whether uplink CoMP DMRS exists.
7. A coordinated multipoint transmission, CoMP, system comprising a plurality of base stations, wherein each of said plurality of base stations comprises:
the base station comprises a sending module and a receiving module, wherein the sending module is used for sending a message to a base station of a cell adjacent to the sending module, and the message comprises resource occupation information of an uplink demodulation reference signal (DMRS);
a receiving module, configured to receive the message from the base station of the neighboring cell;
a determining module, configured to determine a scheduling policy of the cell and/or resources used for transmitting the uplink DMRS according to the resource occupancy information of the uplink DMRS;
the sending module sends the message to the base station of the adjacent cell, including: the sending module of the base station of each cell in the cooperation set sends the message to the base station of the cell cooperating with the sending module; or, the sending module of the base station of the serving cell sends the message of the serving cell to the base stations of other cells in the cooperation set;
the scheduling strategy is that the base station receiving the message does not schedule users at the edge of the cell on a physical resource block PRB corresponding to the resource occupation information of the uplink DMRS, and the resource used for sending the uplink DMRS is a resource which does not overlap with the resource indicated by the resource occupation information of the uplink DMRS.
8. The system of claim 7, wherein each of the plurality of base stations further comprises:
and the setting module is used for setting an OCC (orthogonal code control) occupation indication information element of the uplink DMRS through the message of the X2 interface to express the resource occupation information of the uplink DMRS.
9. The system according to claim 8, wherein the setting module is further configured to use bit characters to represent OCC occupancy information on each PRB, where each bit corresponds to one PRB, and on each bit, 0 and 1 respectively represent that different OCCs are used; or, an enumeration character is used for representing OCC occupation information on each PRB and/or information whether uplink CoMPDMRS exists, wherein different enumeration values use different OCCs and/or represent whether uplink CoMPDMRS exists.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110182414.7A CN102395163B (en) | 2011-06-30 | 2011-06-30 | The exchange method and cooperative multicast system of information in cooperative multicast system |
| PCT/CN2011/084153 WO2013000253A1 (en) | 2011-06-30 | 2011-12-16 | Information exchanging method in coordinated multipoint transmission and reception system and coordinated multipoint transmission and reception system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110182414.7A CN102395163B (en) | 2011-06-30 | 2011-06-30 | The exchange method and cooperative multicast system of information in cooperative multicast system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102395163A CN102395163A (en) | 2012-03-28 |
| CN102395163B true CN102395163B (en) | 2017-09-15 |
Family
ID=45862350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110182414.7A Active CN102395163B (en) | 2011-06-30 | 2011-06-30 | The exchange method and cooperative multicast system of information in cooperative multicast system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102395163B (en) |
| WO (1) | WO2013000253A1 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012126404A2 (en) * | 2012-04-17 | 2012-09-27 | 华为技术有限公司 | Method and device for determining coordinated multi-point transmission coordinated set |
| WO2014018914A1 (en) * | 2012-07-27 | 2014-01-30 | Huawei Technologies Co., Ltd. | System and method for multiple point communications |
| WO2014019155A1 (en) * | 2012-08-01 | 2014-02-06 | Telefonaktiebolaget L M Ericsson(Publ) | Method and arrangement for acquiring scheduling information |
| EP2912872A4 (en) * | 2012-10-26 | 2016-10-26 | Nokia Solutions & Networks Oy | Scheduling coordination |
| CN102932850B (en) * | 2012-11-05 | 2016-03-02 | 华为技术有限公司 | Base station, network system and communication method |
| US9521637B2 (en) | 2013-02-14 | 2016-12-13 | Blackberry Limited | Small cell demodulation reference signal and initial synchronization |
| CN104349385B (en) * | 2013-07-26 | 2018-01-19 | 电信科学技术研究院 | A kind of data transmission method and device for carrying shunting scene |
| CN105519157B (en) * | 2013-11-01 | 2019-05-07 | 上海诺基亚贝尔股份有限公司 | Method and device for inter-cell interference suppression |
| JP6263803B2 (en) * | 2013-12-13 | 2018-01-24 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Interference control method, interference control apparatus, and interference control system |
| EP3165036B1 (en) * | 2014-07-01 | 2018-12-26 | Telefonaktiebolaget LM Ericsson (publ) | Predicting resource scheduling |
| CN105592552B (en) * | 2014-10-21 | 2021-02-19 | 中兴通讯股份有限公司 | Combined interference suppression method and device, and method and device for realizing uplink CoMP |
| WO2016065638A1 (en) | 2014-10-31 | 2016-05-06 | 华为技术有限公司 | Data transmission method and device |
| CN105873074A (en) * | 2015-01-23 | 2016-08-17 | 中兴通讯股份有限公司 | Adjacent channel inter-system interference coordination method and device |
| CN104717685A (en) * | 2015-03-31 | 2015-06-17 | 深圳酷派技术有限公司 | Cooperation method and system among terminalized cells and terminal |
| CN107733474B (en) | 2016-08-12 | 2020-11-13 | 上海诺基亚贝尔股份有限公司 | Method and apparatus for multiple-input multiple-output communication |
| CN114844608A (en) | 2017-02-17 | 2022-08-02 | 华为技术有限公司 | Multi-transmission node transmission method and communication device |
| CN108112077B (en) * | 2017-05-05 | 2024-02-27 | 中兴通讯股份有限公司 | Resource allocation method and device |
| CN111436064B (en) * | 2019-01-11 | 2023-05-09 | 中国移动通信有限公司研究院 | Method and device for cooperative transmission of control channel |
| CN114584271B (en) | 2019-06-25 | 2025-03-25 | 华为技术有限公司 | Resource determination method and device |
| CN114071737A (en) * | 2020-08-06 | 2022-02-18 | 维沃移动通信有限公司 | Negotiation method for sending signal and network side node |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777940A (en) * | 2009-01-12 | 2010-07-14 | 华为技术有限公司 | Method, device and system for transmitting uplink information |
| CN101841921A (en) * | 2010-04-29 | 2010-09-22 | 北京邮电大学 | Transmitting method for channel detection pilot frequency in collaboration multipoint scene |
| CN102065557A (en) * | 2010-12-31 | 2011-05-18 | 中兴通讯股份有限公司 | Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101639407B1 (en) * | 2009-07-30 | 2016-07-13 | 엘지전자 주식회사 | Apparatus and method for transmitting channel state information in a mobile communication system |
| CN102013903B (en) * | 2009-09-29 | 2013-11-06 | 电信科学技术研究院 | Method and equipment for space coordination among cells |
-
2011
- 2011-06-30 CN CN201110182414.7A patent/CN102395163B/en active Active
- 2011-12-16 WO PCT/CN2011/084153 patent/WO2013000253A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777940A (en) * | 2009-01-12 | 2010-07-14 | 华为技术有限公司 | Method, device and system for transmitting uplink information |
| CN101841921A (en) * | 2010-04-29 | 2010-09-22 | 北京邮电大学 | Transmitting method for channel detection pilot frequency in collaboration multipoint scene |
| CN102065557A (en) * | 2010-12-31 | 2011-05-18 | 中兴通讯股份有限公司 | Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013000253A1 (en) | 2013-01-03 |
| CN102395163A (en) | 2012-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102395163B (en) | The exchange method and cooperative multicast system of information in cooperative multicast system | |
| CN101882980B (en) | Method and system for indicating uplink demodulation reference signal | |
| EP2509244B1 (en) | Method and system for signaling configuration of physical uplink shared channel | |
| CN102413572B (en) | The sending method and device of DMRS and its signaling | |
| KR102105983B1 (en) | Uplink hybrid acknowledgement signaling in wireless communications systems | |
| CN103944665B (en) | Sending method, the device and system of uplink demodulation reference signal | |
| US10141987B2 (en) | Method for feeding back reference signal information in multi-antenna wireless communication system and apparatus therefor | |
| US8964591B2 (en) | Method and device for transmitting/receiving channel state information in a wireless communication system | |
| CN101841357B (en) | Downlink data transmission method, base station and user equipment | |
| US9214996B2 (en) | Method of receiving or transmitting downlink signal in wireless communication system and device for performing the method | |
| CN102427396A (en) | Information interaction method and base station for inter-cell uplink demodulation reference signals | |
| EP2882205B1 (en) | Control information processing method and device | |
| US11005625B2 (en) | Reference signal indication method and apparatus to improve spectrum efficiency | |
| US20170111098A1 (en) | Channel quality measurement method in multiple antenna wireless communication system and device for same | |
| CN105308889A (en) | Method for interference cancellation in wireless communication system and apparatus therefor | |
| CN105359569A (en) | Method for channel state report in wireless communication system and apparatus therefor | |
| WO2013063891A1 (en) | Resource configuration method and system for uplink demodulation reference signal | |
| CN105191174A (en) | Method for canceling interference in wireless communication system and apparatus therefor | |
| WO2014168323A1 (en) | Layer alignment method and apparatus for multilayer three-dimensional beamforming in wireless communication system | |
| JP2016119496A (en) | Base station device, terminal device, radio communication system, and integrated circuit | |
| CN102301812A (en) | Base station and wireless communication system | |
| WO2013151405A1 (en) | Method and device for performing coordinated precoding in wireless access system | |
| WO2013151406A1 (en) | Coordinated beamforming method in wireless access system, and apparatus therefor | |
| US20190349168A1 (en) | Reference signal sending method and apparatus | |
| JP2014506427A (en) | A method for transmitting multi-point cooperative data based on orthogonal covering codes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |