Method and device for adjusting preamble sequence number
A sequence and number technology, applied in the field of adjusting the number of preamble sequences, can solve the problems of unbalanced random access requests, increasing the delay of the competitive random access process, increasing the conflict probability of the competitive random access process, etc., to reduce the preamble The probability of conflict, the effect of improving network service quality and reducing system delay
Active Publication Date: 2010-10-27
DATANG MOBILE COMM EQUIP CO LTD
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Furthermore, for another example, in the random group, if the number of preamble sequences divided into group A and group B is unreasonable, it will lead to unbalanced random access requests falling into the two groups, thereby increasing contention The collision probability of the random access process increases the delay of the contention random access process
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[0055] In the LTE system, in order to reasonably divide the preamble sequences used in each PRACH channel in real time according to the network operation status, the embodiment of the present application provides two implementation methods,
[0056] The first implementation method is: within the set time length, perform uplink synchronous detection on the physical random access PRACH channel, and obtain the detection result; according to the detection result, count the preamble sequence carried by the uplink signal within the set time length The first cumulative number of times that the sequence belongs to the first set, and the second cumulative number of times that belong to the second set; wherein, the first set includes a preamble sequence for a non-competitive random access procedure, and the second set Contains a preamble sequence for a contention-type random access procedure; calculates a first target value representing the number of preamble sequences divided into the f...
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The invention discloses a method for adjusting preamble sequence number, which comprises the following steps that: according to the result that physical random access to a PRACH channel for uplink synchronous detection within a period of time, determining first accumulation times that a preamble sequence carried by an uplink signal belongs to a first set, and second accumulation times that the sequence belongs to a second set; then according to the first and the second accumulation times, calculating a first target value which represents the preamble sequence number classified to the first set, and a second target value which represents the preamble sequence number classified to the second set; and respectively adjusting the preamble sequence number included in the first set and the second set into the first target value and the second target value. Consequently, the invention can timely adjust the distribution of the preamble sequence sets according to the real-time changes to the network environment so as to significantly reduce the probability of preamble conflict in a system, and effectively reduce the system delay. Simultaneously, the invention discloses a corresponding base station.
Description
technical field [0001] The present application relates to a communication system, in particular to a method and device for adjusting the number of preamble sequences. Background technique [0002] In an existing Long Term Evolution (LTE) system, the terminal side uses a physical random access channel (Physical Random Access Channel, PRACH) to initiate a random access procedure to the network side to establish an uplink. In this process, the set of preamble sequences (preamble sequences) that can be used by a PRACH channel can be divided into the following two categories: [0003] The first type is used for contention-free random access procedures, and is called a dedicated group. [0004] The second type is used for a contention-type random access process, which is called a random group. [0005] In system information, use the parameter numberOfRA-Preambles to indicate the number of preamble sequences included in the random group. [0006] The random group is further divi...
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IPC IPC(8): H04W24/02H04W24/08H04W74/08
Inventor 张杰董书霞
Owner DATANG MOBILE COMM EQUIP CO LTD