CN102036311A - Method and system for acquiring cooperative multi-point (CoMP) supporting capacity of terminal - Google Patents

Abstract

The invention provides a method for acquiring cooperative multi-point (CoMP) supporting capacity of a terminal to solve the technical problem so as to report the CoMP supporting capacity of user equipment (UE) to a network. The method comprises the following steps that: a base station transmits a terminal capacity query message to the terminal; and the terminal returns a terminal capacity information message to the base station, wherein the terminal capacity information message comprises terminal wireless access network capacity information, and the terminal wireless access network capacity information carries CoMP supporting capacity information of the terminal.

Description

Method and system for obtaining CoMP support capability of terminal

technical field

The present invention relates to the technical field of wireless communication, and more specifically, to a method and system for acquiring CoMP support capability of a terminal.

Background technique

The Long Term Evolution (LTE for short) network of the third generation mobile communication consists of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN for short) and the Evolved Packet Core (Evolved Packet Core) , referred to as EPC) network composition. E-UTRAN includes a collection of evolved base stations (Evolved NodeB, referred to as eNB), EPC includes Mobile Management Entity (Mobile Management Entity, referred to as MME) and Serving Gateway (Serving Gateway, referred to as S-GW), etc., the network architecture is flat change. The eNB and MME/S-GW are connected through the S1 interface, and the eNBs can be connected through the X2 interface. S1 and X2 are logical interfaces. One MME/S-GW can manage one or more eNBs, and one eNB can also be controlled by multiple MMEs/S-GWs. One eNB can manage one or more cells. The advanced LTE (LTE Advanced, referred to as LTE-A) system evolved from the LTE system, and its network architecture is consistent with that of LTE. In LTE-A, some new technologies such as coordinated multipoint (Coordinated Multipoint, CoMP for short), spectrum aggregation and relay are adopted to enhance system performance.

In E-UTRAN, uplink/downlink data is transmitted through uplink/downlink shared channels. Resources are allocated by the eNB to each user equipment (User Equipment, referred to as UE). The access technology adopted by E-UTRAN is OFDM (Orthogonal Frequency Division Multiplexing), and its wireless resources appear in two dimensions of time and frequency. For a UE located at the edge of eNB coverage, it may simultaneously receive wireless signals from several nearby neighboring eNBs, and the wireless signals transmitted by it may also be received by multiple nearby eNBs. In this case, multiple eNBs can be coordinated to jointly receive and transmit uplink and downlink data to the UE at the same time, which is the so-called CoMP technology. By using CoMP and related signal processing technology, the gain of data diversity and spatial multiplexing can be obtained on the uplink and downlink wireless signals, so as to improve the reliability and data throughput of wireless data transmission.

Multiple adjacent cells participating in CoMP coordination may belong to the same eNB, or may belong to different eNBs (Inter eNBs). When CoMP cooperation occurs between different eNBs, the UE only accepts uplink and downlink resource scheduling instructions on a physical downlink control channel (PDCCH for short) of one of the eNBs. This eNB is called serving eNB (Serving eNB), and others are called non-serving eNB (Non-Serving eNB) or cooperative eNB (Collaborative eNB). In the CoMP scenario where multiple eNBs participate, in order to achieve the purpose of joint transmission and reception of uplink and downlink data, the serving eNB needs to send resource scheduling instructions to the cooperating eNB through the X2 interface, so that the cooperating eNB can communicate with the serving eNB at the same time and frequency. The resource transmits/receives data to/from the UE.

Considering the link direction, CoMP can be divided into uplink CoMP and downlink CoMP. Uplink CoMP means that multiple geographically dispersed points jointly receive the signal sent by the UE, which is equivalent to uplink macro diversity. What the UE needs to know is only some downlink control signaling related to uplink transmission, such as: scheduling grant, ACK/NACK in HARQ (Hybrid Automatic Repeat reQuest), power control signaling, etc. However, these signalings are provided by the serving cell, so uplink CoMP does not need to add any downlink control signaling, and only needs to use the original downlink control signaling. The situation of downlink CoMP is much more complicated, and the impact on the protocol is relatively large. Downlink CoMP has the following modes: joint transmission (Joint Process, referred to as JP), cooperative beamforming (Cooperative Beam-forming, referred to as CB) and cooperative scheduling (Cooperative Scheduling, referred to as CS) mode.

A joint transmission (JP) mode means transmitting data for a UE through multiple cells. This technology is especially effective for single-antenna cells, because it can form a zero limit of spatial interference, and at the same time obtain the transmission channel gain of multi-cell combination. An effective JP depends on a low-latency high-speed link to support data transmission between the serving cell and the cooperating cell, and the transmission of a Channel Status Indicator (CSI). Therefore, the JP mode is more suitable for scenarios such as BBU+RRU (Baseband Unit+Remote Radio Unit) connected between different cells in the eNB or through optical fibers.

The coordinated beamforming (CB) mode considers the downlink spatial channel to the UE, and considers reducing interference to UEs in neighboring cells through appropriate beam selection. Due to the lower demand for low-latency high-speed links, the application range of CB is increased.

The Coordinated Scheduling (CS) mode can be considered as a cell setting a gate on a specific series of resources, and the gate control is performed when these resources are beneficial to the throughput of the cell or to the fairness of a series of UEs in neighboring cells. CS can solve the high speed UE problem when the spatial interference nulling method cannot be utilized. Usually, the CS can adopt hard silencing mode (no downlink transmission scheduling at this time) or soft silencing mode (reduce downlink transmission power value at this time).

For the application of CoMP technology, in addition to the support from the network side, the UE must also have the corresponding CoMP support capability. For example, the UE needs to support De-Modulation Reference Signal (DMRS for short), support for multiple cells Simultaneous demodulation etc. When the network side enables CoMP for the UE, it needs to know the CoMP support capability of the UE first, so as to decide whether to enable CoMP, and which CoMP mode (JP/CB/CS) to choose, etc. How to report the CoMP support capability of the UE to the network is the content to be described in the present invention.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for obtaining the CoMP supporting capability of the terminal, so as to report the CoMP supporting capability of the UE to the network.

The method includes the following steps: the base station sends a terminal capability inquiry message to a terminal in a connected state; and the terminal returns a terminal capability information message to the base station, wherein the terminal capability information message includes terminal wireless access network capability information, and the terminal wireless access network The capability information carries CoMP support capability information of the terminal.

Wherein, the step of the terminal returning the terminal capability information message to the base station includes: receiving the terminal capability query message sent by the base station; responding to the terminal capability query message, adding the CoMP support of the terminal to the terminal wireless access network capability information of the terminal capability information message capability information; and returning a terminal capability information message to the base station.

Wherein, the base station determines whether to enable CoMP according to the CoMP support capability information, and if CoMP is enabled, which CoMP mode to select.

Wherein, the CoMP support capability information includes the following information or any combination thereof: indication information indicating whether demodulation pilot DMRS is supported, and the maximum number of supported layers; indication information indicating whether simultaneous demodulation of multiple cells is supported Information, and the maximum number of simultaneously demodulated cells supported; indication information for indicating whether to support the precoding index PMI; indication information for indicating whether to support the channel correlation matrix R.

Among them, when the terminal supports DMRS, and supports PMI or R, enable CoMP of Coordinated Beamforming CB or Coordinated Scheduling CS mode for the terminal; or when the terminal supports DMRS, supports PMI or R, and supports simultaneous demodulation of multiple cells , enable CoMP in any mode of joint transmission JP, CB, and CS for the terminal; or when the conditions for enabling CoMP in JP mode are met, the number of CoMP transmission points participating in simultaneous data transmission should be less than or equal to the maximum supported simultaneous solution or when CoMP is enabled for the terminal, appropriate resources can be allocated for the CoMP process according to the maximum number of DMRS layers supported by the UE, so as to avoid waste of resources caused by single allocation based on the maximum value.

Wherein, the CoMP support capability information may also include the following information or any combination thereof: indication information indicating whether CoMP is supported; indication information indicating whether CoMP in JP mode is supported, and the maximum number of supported transmission points.

Among them, when the terminal supports CoMP but does not support CoMP in JP mode, enable CoMP in CB or CS mode for the terminal; or when the terminal supports CoMP and supports CoMP in JP mode, enable any of JP, CB, and CS for the terminal. CoMP in one mode; or when the conditions for enabling CoMP in JP mode are met, the number of CoMP transmission points used to send data at the same time should be less than or equal to the maximum number of transmission points supported; or when the terminal does not support CoMP, no The terminal enables CoMP.

Another technical problem to be solved by the present invention is to provide a system for obtaining the CoMP support capability of the terminal, so as to physically report the CoMP support capability of the UE to the network.

The system includes: a sending module, configured to send a terminal capability inquiry message to the terminal through the base station; and a return module, configured to return a terminal capability information message to the base station through the terminal, wherein the terminal capability information message includes terminal wireless access network capability information , the terminal wireless access network capability information carries the CoMP support capability information of the terminal.

Wherein, the returning module further includes: a receiving module, configured to receive a terminal capability inquiry message sent by the base station; and an adding module, configured to respond to the terminal capability inquiry message, and add CoMP support capability information of the terminal.

Wherein, the base station determines whether to enable CoMP according to the CoMP support capability information, and if CoMP is enabled, which CoMP mode to select.

The beneficial effect of the method and system provided by the present invention is that, according to the present invention, by reporting the CoMP support capability of the UE to the network, the network side can first understand the CoMP support capability of the UE when enabling CoMP for the UE, so that the network can Correctly determine whether to enable CoMP, and which CoMP mode (JP/CB/CS) to select, etc.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 shows the transfer process of terminal capability information (including CoMP support capability information) according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in FIG. 1 , the method for obtaining the CoMP support capability of the terminal according to the present invention includes the following steps: the base station sends a terminal capability query message (that is, 101 in FIG. 1 ) to the terminal; and the terminal returns the terminal capability to the base station. Information message (ie, 103 in FIG. 1 ), wherein the terminal capability information message includes terminal radio access network capability information, and the terminal radio access network capability information carries CoMP support capability information of the terminal.

Next, an exemplary embodiment based on the present invention will be described in detail with reference to FIG. 1 .

Specific embodiment one is described as follows (in conjunction with Fig. 1):

The eNB sends a UE Capability Enquiry (UECapabilityEnquiry) message to the UE in the connected state when necessary.

After receiving the UECapabilityEnquiry message sent by the eNB, the UE fills in the UECapabilityInformation message, and adds the CoMP support capability information of the UE to the UE E-UTRAN capability (UE-EUTRA-Capability) information included in the UECapabilityInformation message. CoMP support capability information includes the following or any combination thereof:

An indication of whether to support DMRS; and the maximum number of layers supported.

An indication of whether to support simultaneous demodulation of multiple cells; and the maximum number of supported simultaneous demodulation cells.

Whether to support the indication of PMI; whether to support the indication of R.

The UE returns a UE Capability Information (UECapabilityInformation) message to the eNB, and the message carries the added CoMP support capability information of the UE.

After receiving the UECapabilityInformation message returned by the UE, the eNB reads the CoMP support capability information of the UE contained therein for subsequent decision-making.

Further, when the serving eNB intends to enable CoMP for the UE, it can judge whether the UE has the CoMP support capability and the degree of CoMP support according to the obtained CoMP support capability information of the UE, so as to correctly determine whether to enable CoMP and which one to choose. A CoMP mode, etc. For example: a. When the UE supports DMRS and supports PMI or R, CoMP in CB or CS mode can be enabled for the UE. b. When the UE supports DMRS, supports PMI or R, and supports simultaneous demodulation of multiple cells, CoMP in any mode of JP, CB, and CS can be enabled for the UE. c. When the condition of enabling CoMP in JP mode is met, the number of CoMP transmission points participating in simultaneous data transmission cannot exceed the maximum number of simultaneous demodulation cells supported by the UE. d. When CoMP is enabled for the UE, appropriate resources can be allocated for the CoMP process according to the maximum number of DMRS layers supported by the UE, so as to avoid waste of resources caused by single allocation based on the maximum value.

Further, the above CoMP support capability information of the UE may also be expressed in the following manner, or may be any combination of the following contents:

The maximum number of layers that support DMRS (when it is 0, it means that DMRS is not supported).

The maximum number of cells that support simultaneous demodulation (when it is 0, it means that simultaneous demodulation of multiple cells is not supported).

Whether to support the indication of PMI; whether to support the indication of R.

Specific embodiment two is described as follows (in conjunction with Fig. 1):

The eNB sends a UE Capability Enquiry (UECapabilityEnquiry) message to the UE in the connected state when necessary.

After receiving the UECapabilityEnquiry message sent by the eNB, the UE fills in the UECapabilityInformation message, and adds the CoMP support capability information of the UE to the UE E-UTRAN capability (UE-EUTRA-Capability) information included in the UECapabilityInformation message. CoMP support capability information includes the following:

Indication of whether CoMP is supported.

An indication of whether to support CoMP in JP mode; and the maximum number of supported transmission points.

The UE returns a UE Capability Information (UECapabilityInformation) message to the eNB, and the message carries the added CoMP support capability information of the UE.

After receiving the UECapabilityInformation message returned by the UE, the eNB reads the CoMP support capability information of the UE contained therein for subsequent decision-making.

Furthermore, when the eNB intends to enable CoMP for the UE, it can judge whether the UE has the CoMP support capability and the degree of CoMP support based on the obtained CoMP support capability information of the UE, so as to correctly determine whether to enable CoMP and which one to choose CoMP mode, etc. For example: a. When the UE supports CoMP but does not support CoMP in JP mode, CoMP in CB or CS mode can be enabled for the UE. b. When the UE supports CoMP and CoMP in JP mode, CoMP in any one of JP, CB and CS modes can be enabled for the UE. c. When the condition of enabling CoMP in JP mode is met, the number of CoMP transmission points participating in simultaneous data transmission cannot exceed the maximum number of transmission points supported by the UE. d. When the UE does not support CoMP, CoMP cannot be enabled for the UE; at this time, the "indication of whether to support CoMP in JP mode; and the maximum number of supported transmission points" should be considered invalid.

Further, the above CoMP support capability information of the UE may also be expressed in the following manner, or may be any combination of the following contents:

Indication of whether CoMP is supported.

The maximum number of transmission points that support the JP mode (when it is 0, it means that CoMP in the JP mode is not supported).

Specific embodiment three is described as follows (in conjunction with Fig. 1):

The eNB sends a UE Capability Enquiry (UECapabilityEnquiry) message to the UE in the connected state when necessary.

After receiving the UECapabilityEnquiry message sent by the eNB, the UE fills in the UECapabilityInformation message, and adds the CoMP support capability information of the UE to the UE E-UTRAN capability (UE-EUTRA-Capability) information included in the UECapabilityInformation message. CoMP support capability information includes the following:

Indication of whether CoMP is supported.

Indication of whether CoMP in JP mode is supported.

The UE returns a UE Capability Information (UECapabilityInformation) message to the eNB, and the message carries the added CoMP support capability information of the UE.

After receiving the UECapabilityInformation message returned by the UE, the eNB reads the CoMP support capability information of the UE contained therein for subsequent decision-making.

Furthermore, when the eNB intends to enable CoMP for the UE, it can judge whether the UE has the CoMP support capability and the degree of CoMP support based on the obtained CoMP support capability information of the UE, so as to correctly determine whether to enable CoMP and which one to choose CoMP mode, etc. For example: a. When the UE supports CoMP but does not support CoMP in JP mode, CoMP in CB or CS mode can be enabled for the UE. b. When the UE supports CoMP and CoMP in JP mode, CoMP in any one of JP, CB and CS modes can be enabled for the UE. c. When the UE does not support CoMP, CoMP cannot be enabled for the UE; at this time, the "indication of whether to support CoMP in JP mode" should be regarded as invalid.

In addition, the present invention also proposes a system (not shown) for obtaining a CoMP support capability of a terminal, the system includes: a sending module, configured to send a terminal capability inquiry message to the terminal through a base station; and a returning module, used The terminal returns a terminal capability information message to the base station, wherein the terminal capability information message includes terminal radio access network capability information, and the terminal radio access network capability information carries CoMP support capability information of the terminal.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a method of obtaining the coordinate multipoint CoMP tenability of terminal is characterized in that, may further comprise the steps:

The base station sends the terminal capability apply for information to terminal; And

Described terminal is returned terminal ability information message to described base station,

Wherein, comprise terminal wireless Access Network ability information in the described terminal ability information message, carry the CoMP tenability information of described terminal in the described terminal wireless Access Network ability information.

2. method according to claim 1 is characterized in that, described terminal comprises in the step of terminal ability information message is returned in described base station:

Receive the described terminal capability apply for information that described base station sends;

In response to described terminal capability apply for information, in the terminal wireless Access Network ability information of described terminal ability information message, add the CoMP tenability information of described terminal; And

Described terminal ability information message is back to described base station.

3. method according to claim 2 is characterized in that, described base station is determined according to described CoMP tenability information:

Whether enable CoMP, and

If enable CoMP, select which kind of CoMP pattern.

4. according to each described method in the claim 1 to 3, it is characterized in that described CoMP tenability information comprises following information or its combination in any:

Be used to represent whether to support the indication information of demodulation pilot frequency DMRS, and the number of the layer of the maximum of supporting;

Be used to represent whether support the indication information of a plurality of sub-districts demodulation simultaneously, and the number of cells of the demodulation maximum of supporting the time;

Be used to represent whether to support the indication information of precoding index PMI; Or

Be used to represent whether to support the indication information of channel correlation matrix R.

5. method according to claim 4 is characterized in that,

When described terminal is supported DMRS, and when supporting PMI or R, described terminal is enabled the CoMP of cooperative beam figuration CB pattern or cooperative scheduling CS pattern;

Support DMRS when described terminal, support PMI or R, and support a plurality of sub-districts to separate timing simultaneously, described terminal is enabled the CoMP of arbitrary pattern among joint transmission JP, CB, the CS;

When satisfying the condition of the CoMP enable the JP pattern, the number of cells of demodulation when the number of participating in the CoMP transmission point that sends data simultaneously should be less than or equal to the maximum of described support; Perhaps

When described terminal was enabled CoMP, the number of the layer of the maximum of the DMRS that can support according to UE was that this CoMP process is distributed suitable resource, causes the wasting of resources to avoid distributing by maximum singlely.

6. according to each described method in the claim 1 to 3, it is characterized in that described CoMP tenability information comprises following information or its combination in any:

Be used to represent whether to support the indication information of CoMP; Or

Be used to represent whether support the indication information of the CoMP of JP pattern, and the number of the transmission point of the maximum of supporting.

7. method according to claim 6 is characterized in that,

When described terminal is supported CoMP, but when not supporting the CoMP of JP pattern, described terminal is enabled the CoMP of CB or CS pattern;

When described terminal is supported CoMP, and when supporting the CoMP of JP pattern, described terminal is enabled the CoMP of arbitrary pattern among JP, CB, the CS;

When satisfying the condition of the CoMP enable the JP pattern, the number that is used for sending simultaneously the CoMP transmission point of data should be less than or equal to the number of transmission point of the maximum of described support; Perhaps

When described terminal is not supported CoMP, described terminal is not enabled CoMP.

8. a system that obtains the coordinate multipoint CoMP tenability of terminal is characterized in that, comprising:

Sending module is used for sending the terminal capability apply for information by the base station to terminal; And

Return module, be used for returning terminal ability information message to described base station by described terminal,

Wherein, comprise terminal wireless Access Network ability information in the described terminal ability information message, carry the CoMP tenability information of described terminal in the described terminal wireless Access Network ability information.

9. system according to claim 8 is characterized in that, described returning in the module also comprises:

Receiver module is used to receive the described terminal capability apply for information that described base station sends; And

Add module, be used for, in the terminal wireless Access Network ability information of described terminal ability information message, add the CoMP tenability information of described terminal in response to described terminal capability apply for information.

10. system according to claim 9 is characterized in that, described base station is determined according to described CoMP tenability information:

Whether enable CoMP, and

If enable CoMP, select which kind of CoMP pattern.

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