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Method and device for generating random access limit set leader sequences in LTE (Long Term Evolution) system

A preamble sequence and random access technology, applied in electrical components, wireless communication, etc., can solve the problem of long generation time of random access preamble sequence, achieve the effect of reducing generation time and improving system efficiency

Active Publication Date: 2012-07-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0046] In view of this, the present invention proposes a method for generating a preamble sequence of a random access restricted set of an LTE system, so as to solve the problem that the generation time of the random access preamble sequence existing in the prior art is too long

Method used

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  • Method and device for generating random access limit set leader sequences in LTE (Long Term Evolution) system
  • Method and device for generating random access limit set leader sequences in LTE (Long Term Evolution) system
  • Method and device for generating random access limit set leader sequences in LTE (Long Term Evolution) system

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specific Embodiment 1

[0080] 1. The physical layer is built on different N CSconfig The mapping relationship list table1 of N corresponding to different indexes under the configuration, and d corresponding to different indexes respectively u The mapping relationship list table2 is stored in the memory;

[0081] In this embodiment, the table1 includes all indexes with values ​​ranging from 0 to 837 in N CSconfig = N corresponding to the case of 0 to 14; the table2 includes d corresponding to all indexes whose values ​​are 0 to 837 u ;

[0082] 2. The physical layer receives the set type parameters, preamble format, and index issued by the upper layer init , N CSconfig , N ZC , and C preamble ;

[0083] 3. According to N CSconfig , preamble format and set type parameters get N CS , set index=index init ;

[0084] 4. If the set type parameter stipulates that a restricted set is used, the physical layer finds the N and d corresponding to the index from the table1 and table2 u ; Go to step 5...

specific Embodiment 2

[0105] 1. The physical layer is built on different N CSconfig The mapping relationship list table1 of N corresponding to different indexes under the configuration, and d corresponding to different indexes respectively u The mapping relationship list table2 is stored in the memory;

[0106] In this embodiment, the table1 includes all indexes whose values ​​are even numbers in N CSconfig = N corresponding to the case of 0 to 14; the table2 includes d corresponding to all indexes whose values ​​are even numbers u ;

[0107] Steps 2~3 are identical with specific embodiment 1;

[0108] 4. If the set type parameter stipulates that a restricted set is used, the physical layer finds the N and d corresponding to the index from the table1 and table2 u ; Otherwise, go to step 6;

[0109] In this embodiment, the physical layer finds the N and d corresponding to the index from the table1 and table2 u include:

[0110] If the index is an odd number, according to the N issued by the u...

specific Embodiment 3

[0128] 1. The physical layer is built on different N CSconfig The mapping relationship list table1 of N corresponding to different indexes under the configuration, and d corresponding to different indexes respectively u The mapping relationship list table2 is stored in the memory;

[0129] In this embodiment, the table1 includes all indexes whose value is an odd number in N CSconfig = N corresponding to the case of 0 to 14; the table2 includes d corresponding to all indexes whose value is an odd number u ;

[0130] Steps 2~3 are identical with specific embodiment 1;

[0131] 4. If the set type parameter stipulates that a restricted set is used, the physical layer finds the N and d corresponding to the index from the table1 and table2 u ; Otherwise, go to step 6;

[0132] In this embodiment, the physical layer finds the N and d corresponding to the index from the table1 and table2 u include:

[0133] If the index is an even number, according to the N issued by the upper ...

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Abstract

The invention discloses a method for generating random access limit set leader sequences in an LTE (Long Term Evolution) system. The method comprises the following steps: a physical layer establishes a mapping relation table 1 between an index and corresponding Ns and a mapping relation table 2 between the index and corresponding dus under different configurations of an NCSconfig and stores the table 1 and the table 2 in a memory device; the physical layer receives leader sequence generating parameters dispatched by an upper level; an NCS is obtained according to the NCSconfig, leader code formats and set type parameters and index= indexinit is set; if a limit set is adopted, an N and a du which correspond to the index are found out from the table 1 and the table 2; a Cv and a u are calculated according to the N and the du; and a final random access leader sequence (xu, v(n)) is generated according to the Cv and the u. The invention further discloses a device which is adaptable to themethod. With the adoption of the method and the device disclosed by the invention, the time for generating the random access leader sequences can be effectively reduced, thus the efficiency of the system is increased.

Description

technical field [0001] The present invention relates to a long-term evolution (referred to as LTE) system random access technology, and in particular to a method and device for generating a preamble sequence of an LTE system random access restricted set. Background technique [0002] Random access plays a very important role in the LTE system. It is the only way for user equipment (UE) to perform initial connection, handover, selective re-establishment, re-uplink synchronization and uplink resource request when switching from idle mode to connected mode. Strategy. According to whether the evolved base station (eNode B for short) assigns dedicated random access resources to the random access procedure initiated by the UE, the random access procedure can be divided into a contention-based method and a non-contention-based method. [0003] For the physical layer of the UE, the primary task of random access is to generate and send the random access preamble. In the process of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
Inventor 黄宗治车迅冯侨沈静王茜竹
Owner SPREADTRUM COMM (SHANGHAI) CO LTD