Method and device for ranging in wireless communication system
A technology of a wireless communication system and a ranging method, which is applied in the directions of wireless communication, synchronization device, multi-frequency code system, etc., can solve the problems of inability to access, unsuccessful ranging of the terminal of the base station, etc., and achieve the effect of avoiding the impact.
Inactive Publication Date: 2010-08-25
BEIJING XINWEI TELECOM TECH
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However, in the specific propagation environment of the actual system, the ranging time slot located at the front end of the uplink business time slot will be interfered by the downlink signal of the long-distance co-frequency base station, resulting in the unsuccessful ranging of the terminal of the base station, so that it cannot access
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[0027] The specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0028] The frame structure of a typical wireless communication system is shown in Figure 1. The ranging time slot is located before the uplink service time slot. When the terminal is ranging, it sends a set of ranging sequences in the ranging time slot, and the base station intercepts a segment of the ranging time slot. signal is detected. However, the terminal ranging method proposed by the present invention improves the frame structure. As shown in FIG. For a certain time interval, the auxiliary ranging channel occupies part of the resources of the uplink service time slot. The terminal ranging process using this frame structure is shown in Figure 3. The terminal sends ranging signals in the main ranging time slot or the auxiliary ranging channel; The base station detects the ranging signal, calculates the synchronization offset, and fee...
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The invention provides a new ranging method, which comprises the following steps that: a, a base station is provided with a main ranging slot and at least one auxiliary ranging channel on the upstream, wherein the auxiliary ranging channel occupies partial resources of an upstream service slot, and a certain interval is kept between the main ranging slot and the auxiliary ranging channel; b, a terminal sends a ranging signal at the main ranging slot or the auxiliary ranging channel; and c, the base station detects the ranging signal, computes synchronization offset and feeds back to the terminal. The invention also provides a device for ranging in an OFDMA wireless communication system. The terminal side comprises an indication receiving unit, a main ranging slot detection unit and an auxiliary ranging channel transmission unit; and the base station side comprises a transmission and detection indication unit, a main ranging slot detection unit and an auxiliary ranging channel detection unit. After the method or the device for ranging the terminal is adopted, the influence of remote co-channel interference on the terminal ranging can be effectively avoided.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a distance measuring method and device in a wireless communication system. Background technique [0002] In a wireless communication system, a terminal acquires correct uplink synchronization and power parameters through ranging. Generally speaking, the ranging process of the terminal is as follows: the terminal first sends a set of ranging sequences in the ranging time slot, and the base station detects the ranging signal in the ranging time slot, and feeds back parameters such as synchronization offset and ranging sequence number to the terminal , the terminal adjusts uplink transmission according to the received information. However, in the specific propagation environment of the actual system, the ranging time slot located at the front of the uplink business time slot will be interfered by the downlink signal of the long-distance co-frequency base station, resul...
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IPC IPC(8): H04W48/10H04W56/00H04L27/26
Inventor 李航黄俊蒋伯峰俞岚邵善友
Owner BEIJING XINWEI TELECOM TECH