Base station and method for preventing random access conflicts
A random access and base station technology, applied in electrical components, wireless communication, etc., can solve problems such as system throughput decline, increase access delay, and deteriorate user experience, so as to increase contribution, alleviate negative effects, and improve spectrum utilization rate effect
Active Publication Date: 2015-06-03
ZTE CORP
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Problems solved by technology
From the perspective of the system, the spectral efficiency is reduced, which will lead to a decrease in system throughput; from the perspective of a single user, the access delay is increased and the user experience is deteriorated.
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[0026] Below, refer to the attached Figure 1~5 The base station and method for preventing random access conflicts of the present invention are described in detail.
[0027] Such as image 3 As shown, the method for preventing random access conflicts of the present invention includes the following steps:
[0028] Step 101: the eNB saves the received aliased preamble sequences sent by each user.
[0029] Step 102: The eNB selects a correlation peak position that exceeds the threshold; for example, the eNB detects the first correlation peak position that exceeds the threshold in the aliased preamble sequence.
[0030] Step 103: According to the correlation peak position, the eNB considers that the correlation peak position corresponds to the preamble sequence of a certain user, sends a random access response authorization for the preamble sequence, and authorizes the user.
[0031] Step 104: The eNB performs offline collision correlation detection: For a certain preamble sequ...
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A base station and method for preventing random access collision are disclosed in the present invention. The method includes the following steps: when an error occurs in the transmission of message 3, an evolved NodeB (eNB) performs analysis according to the offline preamble collision detection result; if the error of message 3 is caused by strong interference, the eNB notifies the user to give up the retransmission of message 3 and initiates a random access again; and if the transmission error of message 3 is caused by the channel fading or noise burst, notifies the user to continue the retransmission. According to the technical solutions of the present invention, the negative effect to the system and users caused by the collision in the random access procedure can be relieved to a certain extent. By analyzing the reasons for the error of message 3, the utilization ratio of the frequency spectrum is increased, and the contribution of the frequency spectrum to the throughput is increased, and the user random access time is reduced.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a base station and method for preventing random access conflicts. Background technique [0002] In the current long-term evolution (Long-Term Evolution, LTE) Release 8 protocol, when the base station (Ehanced NodeB, eNB) detects the preamble (preamble) sent by the user, for a certain preamble sequence, the eNB performs correlation detection in the window . If the correlation peak within the detection window exceeds a certain threshold, it is considered that there is a user using the preamble sequence for random access. However, in actual scenarios, there may be multiple users sending the same preamble on the same resource block (Resource Block) at the same time, such as figure 1 shown. In this way, the eNB can theoretically detect multiple correlation peaks within the window of the preamble sequence. However, in the current implementation, due to the limitation of hardwa...
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IPC IPC(8): H04W74/08H04W88/08
CPCH04W74/0841
Inventor 褚丽莉娄笃仕赵刚
Owner ZTE CORP