Method and apparatus for ranging in wireless relay network

Abstract

In order to solve the problem appearing in the existing wireless relay network that global link information can not be obtained to select an access station because the ranging signal from a mobile station to a base station and the ranging signal from a mobile station to a relay station interfere with each other and the mobile station only transmits a ranging signal to the best access station in the local sense, a solution is provided, which includes: resources which do not interfere with each other are allocated for ranging communication from a mobile station to a base station and ranging communication from the mobile station to a relay station respectively. The mobile station transmits the ranging signal to the base station and the relay station respectively via the allocated resources which do not interfere with each other. The relay station processes the ranging signal from the mobile station and forwards the processed ranging signal to the base station. The base station obtains the ranging signal from the mobile station and the ranging signal processed by the relay station to select a better access station in the global sense for the mobile station. According to the solution, the base station can select a better access station in the global sense for the mobile station, which reduces the interference probability and decreases the transmission power of the transmitter in the mobile station and the control payload and delay, and benefits the quick and effective execution for network entry and handover between cells.

Description

technical field [0001] The present invention relates to a wireless communication network, in particular to a method and device for performing distance measurement in a wireless communication network including a relay station. Background technique [0002] With the increasing demand of users for wireless networks, the requirements of wireless networks for system capacity are also getting higher and higher. How to continuously improve system performance under the condition of limited frequency band resources is an important issue in this field. Since the relay and multi-hop relay technologies play a significant role in extending wireless network coverage and increasing system throughput, they have received more and more attention. In 2005, the IEEE802.16 standard-setting organization established the 802.16j working group. The 802.16j provides multi-hop relay of the air interface on the basis of the IEEE802.16e standard. The 802.16j protocol defines two multi-hop relay working...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the access site of the mobile station is only selected by the mobile station based on local information, and cannot be judged in conjunction with the status of the entire network, so it is relatively one-sided and less flexible

The disadvantage of this solution is that: when the relay station works in transparent mode, the mobile station uses the shared ranging sub-channel to send the same ranging signal, and both the base station and the relay station receive the ranging signal on the shared ranging sub-channel. Therefore, A mobile station with a smaller signal fading with the base station will send a ranging signal with a lower power, so that the ranging signal cannot be correctly received by a relay station with a larger fading with the mobile station. The mobile station with less signal fading will send the ranging signal with lower power, so that the ranging signal cannot be correctly received by the base station with greater fading between the mobile station and the mobile station

Therefore, the mobile station will increase the transmission power of the mobile station transmitter multiple times to retransmit the ranging signal, which will bring additional control overhead and long time delay, which will affect network entry and inter-cell handover, etc. Personnel understand that it is desirable to obtain the shortest possible latency for network entry and inter-cell handover

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