Method and system for avoiding receiving and sending interference
A technology for receiving interference and signal transmission, applied in electrical components, service signaling, wireless communication, etc., can solve the problems of limited accuracy, affecting the reception of the tail part of the uplink signal by the base station, poor robustness, etc.
Active Publication Date: 2012-04-25
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0016] The robustness of this technique is poor
There are two reasons: first, the timing advance Ta, 1 is estimated by the base station according to the position of the received uplink signal, and the accuracy is limited; at the same time, in order to simplify the complexity of the control signaling of the timing advance, a 1-bit control signal is often used to communicate the step forward and backward information
In this way, the timing position will have an earlier or later fluctuation range, and in the case of later fluctuations, it will cause the base station side to receive the uplink transmission signal and send the downlink signal to overlap in the time domain, such as Figure 1b As shown in the shaded part of the oblique line, it affects the reception of the tail part of the uplink signal by the base station
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[0032] According to the method proposed in the present invention, when the base station assigns uplink transmission resources, according to the guard interval (T G ) to determine that at the uplink-downlink conversion point, the last one or more transmission symbols of the uplink subframe are not sent, which is called "puncturing" here. in N ＊ T CP+OS ≥T G In this case, it is possible to ensure that the interference between the base station’s transceiver signals is negligible, where N is the number of punctured symbols, and T CP+OS is the time for each transmitted symbol.
[0033] First please refer to Figure 2a-2d As shown, still taking the TDD LTE short frame format as an example, the 5ms radio frame in the time domain is divided into five 1ms time slots, which are numbered 0, 1, 2, 3, and 4 respectively. Among them, time slot 0 is the downlink time slot, and time slot 2 is the uplink time slot. At the junction of time slot 3 and time slot 4 is the switching point for...
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The invention discloses a method and a system for avoiding signal sending and receiving interference. The method comprises the following steps: constructing an information unit, wherein the information unit comprises special time slot format information which indicates whether a terminal adopts a special time slot format to perform uplink transmission; sending a signaling containing the information unit to a special terminal through a special channel; and according to the special time slot format information in the signaling, determining whether the terminal uses the special time slot format to perform uplink transmission, wherein the special time slot format ensures that at least one final transmission symbol of a subframe transmitted by the terminal in an uplink mode is not sent. Therefore, the method and the system avoid the conflict problem of an uplink signal and a downlink signal of a base station.
Description
technical field [0001] The invention relates to a method and a system for avoiding receiving and sending interference by transmitting and setting special time slots in a time-division duplex wireless communication system. Background technique [0002] With the widespread popularization of mobile networks such as GSM in the past two decades, global voice communication services have achieved great success. Currently, there are more than 1.8 billion mobile voice users worldwide. At the same time, people's communication habits have also evolved from the previous point-to-point (Place to Place) to person-to-person. The rapid development of personal communication has greatly promoted the miniaturization and diversification of personal communication equipment, combined with the capabilities of data services such as multimedia messaging, online games, video on demand, music downloads, and mobile TV, it has greatly met the needs of personal communication and entertainment. [0003]...
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IPC IPC(8): H04W4/20H04W72/12
Inventor 吴涛陈垚简相超张小东魏华
Owner SPREADTRUM COMM (SHANGHAI) CO LTD