Apparatus and method for obtaining up link in radio communication system
A transmission channel and wireless communication technology, applied in the field of wireless communication systems, can solve problems such as ineffectiveness
Inactive Publication Date: 2002-03-06
LUCENT TECH INC
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Problems solved by technology
In addition, if request messages must be transmitted frequently in order to compensate for changes in mobile unit traffic requirements and reduce the adverse effect of lost traffic requests, the wireless system introduces a lot of overhead and becomes very inefficient
Method used
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[0015] As pointed out above, figure 1 The drawing shows the application of a dedicated control channel to transmit uplink transport channel requests in a prior art system. Mobile units such as figure 2 202-1 to 202-Y among them have a dedicated control channel (DCCH) for exchanging various types of control messages. Control messages are transmitted on fixed-length frames. The length of the control message frame is determined by a "one size fits all" approach, so that various types of control messages can fit into a common control message frame. One of the messages transmitted on the dedicated channel is the transmission channel request from the mobile unit. After the control message is transmitted, the mobile unit typically waits for a call from the base station (e.g., figure 2 201) in the response control message. In the event of no response within a predetermined time interval, the mobile unit "times out" and retransmits the control message. Having received the respo...
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Uplink traffic channel allocation is realized by utilizing a dedicated control channel in which a prescribed portion of the control channel resource, for example, frequency, time slot or the like, is reserved for transporting the uplink traffic channel requests. Both the base station and the particular mobile unit know the prescribed portion of the control channel resource a priori. Consequently, when the particular mobile unit transmits an uplink traffic channel request via the prescribed portion of the control channel resource there is no need for adding any control header information, thereby minimizing overhead. Furthermore, the length of the uplink traffic channel requests can be optimally chosen without constraints imposed by other control message schemes. Reduced overhead coupled with the prescribed portion of the control channel resource arriving quite frequently reduces latency in the particular mobile unit acquiring an uplink traffic channel. In one example, delivery of adequate uplink traffic channel request information to the base station, while minimizing the adverse impact of losing requests, is ensured by persistently transmitting the requests. Specifically, after the mobile unit transmits a first request, it transmits a second or even a third request instead of waiting to receive a response message from the base station and / or waiting for a timer to time out. By the mobile unit using such a persistent request transmission scheme, the base station can readily determine the true value of the received request by eliminating the transmission loop delay effect, thereby allowing a sensible assignment decision to be made.
Description
technical field [0001] The present invention relates to wireless communication systems, and more particularly to wireless communication between mobile units and base stations. Background technique [0002] The basic mechanism for a wireless communication system to obtain an uplink transmission channel is to provide each mobile unit with a dedicated control channel to exchange control messages, and the uplink transmission channel transmits data between the base station and one or more mobile units. One such wireless system is a spread spectrum multiple access system based on Orthogonal Frequency Division Multiplexing (OFDM). The system includes the representation of the dedicated control channel for transmitting messages as figure 1 shown. Use fixed-length control messages and utilize a so-called "one size fits all" (one size fits all) method to determine the size of the control messages. Thus, the length of the control message corresponds to the longest message that has...
Claims
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IPC IPC(8): H04J11/00H04L5/02H04W36/00
CPCH04L5/023H04W72/0413H04W72/21
Inventor 拉吉夫·拉路易尔厉镌怿萨斯雅德夫·范卡塔·尤帕拉
Owner LUCENT TECH INC