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Method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations

A technology between base stations and base stations, which is applied in the field of wireless communication and can solve problems such as difficult to meet, high real-time data transmission requirements, and CoMP performance discounts.

Active Publication Date: 2017-03-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The inventors of the present invention have found through research that CoMP technology can effectively eliminate co-channel interference, obtain MIMO diversity gain, and improve spectrum utilization; Co-channel interference (both refer to downlink co-channel interference), the real-time requirements for data transmission are quite high; CoMP is supported for non-ideal transmission between eNodeBs, and the stop-and-wait protocol of asynchronous HARQ is also supported to ensure that each TTI of the UE has The HARQ process is available; while the transmission network between eNodeBs in the current network is generally a non-ideal PTN network, the delay is about a few milliseconds, and it is difficult to meet the requirement that each transmission time interval (TTI: Transmission Time Interval) of the UE has a HARQ process available Full scheduling requirements
Therefore, the current CoMP application still stays inside the eNodeB, unable to achieve seamless coverage of the entire network, which greatly reduces the performance of CoMP in actual mobile network applications.

Method used

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  • Method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations
  • Method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations
  • Method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations

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Experimental program
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Embodiment 1

[0106] This embodiment relates to a method for determining the maximum transmission delay between base stations supported by the UE, such as figure 2 shown, including:

[0107] Step 110, for a UE that supports carrier aggregation CA and decides to use coordinated multi-point CoMP for downlink transmission, the base station determines the usage status of the CA secondary carrier supported by the UE, and the usage status is being used or not used;

[0108] For the accessed UE, the base station can learn whether the UE supports CA and the maximum number of secondary carriers supported by the UE. The base station may notify the UE to configure supported CA secondary carriers through RCC signaling, for data transmission on the CA secondary carriers. If the CA secondary carrier supported by the UE is not configured, the CA secondary carrier is not used.

[0109] Step 120, the base station uses the sum of the RTTs of the CA secondary carriers not used by the UE as the maximum tran...

Embodiment 2

[0122] In this embodiment, based on the maximum transmission delay between base stations supported by the UE determined in the first embodiment, a CoMP cooperative neighboring cell is selected for the UE.

[0123] Such as Figure 4 As shown, the method for selecting a CoMP cooperative neighbor cell in this embodiment includes:

[0124] Step 210, according to the method described in Embodiment 1, the base station determines the maximum transmission delay T between base stations supported by UEs that support CA and decide to use CoMP for downlink transmission DELAY-MAX ;

[0125] Step 220, the base station selects one or more co-frequency neighboring cells as CoMP cooperative neighboring cells from the same-frequency neighboring cells that satisfy the delay condition of the UE; The transmission delay of the base station to which it belongs is less than or equal to T DELAY-MAX .

[0126] In this step, the same-frequency neighbor cell of the UE may be obtained according to the...

Embodiment 3

[0136] This embodiment implements coordinated multi-point CoMP downlink transmission between base stations based on the CoMP cooperative neighboring cell selected for the UE in the second embodiment.

[0137] The method for implementing CoMP transmission between base stations in this embodiment is as follows: Figure 6 shown, including:

[0138] Step 310, the base station sends signaling to the UE that supports carrier aggregation CA and decides to use the CoMP method for downlink transmission, instructing the UE to use the HARQ process of the unused CA secondary carrier for CA primary carrier data transmission;

[0139]For example, the signaling in this step may use secondary carrier reconfiguration signaling, through secondary carrier reconfiguration, the HARQ process of the CA secondary carrier is used for CA primary carrier data transmission, but it is not limited thereto.

[0140] Step 320, the base station determines the CoMP cooperating neighbor cell of the UE accordin...

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Abstract

The invention provides a method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations. The base stations send signaling to UE which supports the CA and is determined to carry out downlink transmission by use of the CoMP way, and indicate the UE to use HARQ of unused CA secondary component carriers for data transmission of CA main component carriers. When the base stations determine that CoMP coordinated adjacent regions of the UE include common-frequency adjacent regions of other base stations, downlink data of the UE is scheduled in advance in a HARQ process of a Pcell and the downlink data and time frequency resource information thereof are sent to the common-frequency adjacent regions of other base stations, thereby carrying out CoMP downlink transmission. According to the invention, through the advanced scheduling of the Pcell and the HARQ process reuse of the CA secondary component carriers, common-frequency interference is eliminated in case of non-ideal transmission cross stations, so bandwidth utilization rate of edge users is increased and CoMP application space is extended.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method for downlink transmission of Coordinated Multiple Points (CoMP: Coordinated Multiple Points Transmission / Reception) and a corresponding base station. Background technique [0002] Hybrid Automatic Repeat reQuest (HARQ: Hybrid Automatic Repeat reQuest) is one of the key technologies of the physical layer in an Orthogonal Frequency Division Multiple Access (OFDMA: Orthogonal Frequency Division Multiple Access) system. Utilizing the HARQ retransmission function and time diversity technology can effectively improve the performance index of the wireless system and significantly improve the communication quality of the system. [0003] The LTE (Long Term Evolution, Long Term Evolution) uplink system will use the same-frequency HARQ technology, and the downlink system will use the asynchronous adaptive HARQ technology. [0004] HARQ adopts SAW (Stop-And-Wait, stop...

Claims

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Application Information

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IPC IPC(8): H04B7/024H04L1/18H04B7/0413
CPCH04B7/024H04L1/1812H04B7/0413
Inventor 王令斌周敬
Owner ZTE CORP
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