Uplink and downlink frame synchronization communication method of communication system including relay station

A communication system and communication method technology are applied in the field of uplink and downlink frame synchronization communication, and can solve the problems of few downlink backhaul resources, small RN cell range, and inability to take into account the backhaul coverage and interference well.

Inactive Publication Date: 2016-05-25
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solution 4 has less interference and more resources available for uplink backhaul, but less downlink backhaul resources, and the RN cell range is not large
[0022] Since the existing solutions still cannot take into account the available resources of backhaul, RN coverage and interference

Method used

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  • Uplink and downlink frame synchronization communication method of communication system including relay station
  • Uplink and downlink frame synchronization communication method of communication system including relay station
  • Uplink and downlink frame synchronization communication method of communication system including relay station

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] Example 1: "Borrowing uplink subframe resource unit is OFDM symbol

[0043] Such as Figure 7 As shown, when the borrowed uplink subframe resource unit is an OFDM symbol, the R-UE normally sends data in the corresponding uplink subframe, but the RN only accepts the first n OFDM symbols, and the remaining m=14-n symbols are used for sending- Reception (Tx-Rx) transition and timing advance TA, the length of TA is equal to the transmission delay from eNB to RN, so that each base station can receive information from each relay station and user terminal synchronously.

example 2

[0044] Example 2: Borrowing accessUL resource units as time slots

[0045] Such as Figure 8 As shown, when the uplink subframe resource unit is used as a time slot, the R-UE is only scheduled to use the previous time slot of the uplink subframe, and the latter time slot is used for Tx-Rx conversion and timing advance TA, TA The length is equal to the transmission delay from eNB to RN.

[0046] The uplink frames are aligned by borrowing the uplink subframe resources above, and the alignment of the corresponding downlink frames can adopt the existing solutions as described in the background technology, for example, it can be completed by delay or reducing the GP length . However, the amount of delay will lead to the loss of complete synchronization between eNB and RN, causing interference problems; the reduction of GP length will lead to the reduction of RN coverage. Therefore, the present invention provides a communication method for synchronously sending downlink informati...

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PUM

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Abstract

The invention provides a communication method for uplink synchronous information reception of a communication system with relay stations, wherein, before receiving last subframe resource of each corresponding uplink frame, each relay station starts the transition of transmission and receiving, and forwards information to corresponding base station with respective preset initial lead, thus each base station can receive information synchronously. The invention provides a communication method for downlink synchronous information reception of the communication system with relay stations, wherein, after each base station transmitting partial subframe resource in each down frame as uplink frame resource to user terminals in respective service area, the user terminals in respective service area do not receive information in the partial subframe resource any more, but each relay station receives information from corresponding base station in the partial subframe resource. Thereby the problems of available resource reduction of return link, coverage area reduction of relay station, interference increase in cells and among cells which are caused by synchronization in the prior art are effectively avoided.

Description

technical field [0001] The invention relates to an uplink and downlink frame synchronous communication method of a communication system including a relay station, belonging to the field of communication. Background technique [0002] As the mobile communication technology with the greatest development potential and the broadest market prospect in today's communication field, it has ushered in the 3G era. However, in order to solve the problems of shortage of spectrum resources, limited system capacity, and increasing user demands, the International Telecommunication Union (ITU) launched a technical solicitation work for the fourth-generation mobile communication system IMT-Advanced in February 2008. In response to the ITU-RIMT-Advanced technical solicitation, 3GPP, which once formulated the most influential 3G UMTS technical standard in the industry, was unwilling to be lonely. In March 2008, it launched the Relay Enhancement System (LongTermEvolution-Advanced, LTE-A ) stan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04L27/26
Inventor 张晨璐徐景杨馨
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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