Method and apparatus for random access
AssigneeHuawei Technologies Co., Ltd.
InventorsChuanfeng He, Xueli Ma
Life of this patent
Estimating the term…
Abstract
Method and apparatus for random access are provided. A base station sends access control information to a UE. The access control information includes an identifier of the UE and an access control command. The UE obtains an access time slot and a preamble signature according to the access control information received from the bases station. Then the UE initiate, according to the access time slot and the preamble signature, a random access procedure with a preamble power ramping. With the embodiments of the present invention, time delay in random access procedures may be decreased so as to enable the UE to complete the uplink access as quickly as possible and provide a feedback for a downlink transmission. Therefore efficiencies of the downlink transmission are enhanced.
Claims16
A method for random access, comprising:
- receiving, by a user equipment (UE) from a base station, access control information comprising a user equipment identifier (UE ID) of the UE, wherein the access control information instructs the UE to perform a random access procedure;
- acquiring, by the UE, an access time slot and a preamble signature according to the received access control information, wherein the acquiring comprises:
- selecting a highest priority access service class (ASC) from a plurality of pre-configured ASCs wherein each one of the pre-configured ASCs has a different priority, and
- obtaining the access time slot and the preamble signature according to the highest priority ASC;
- and
- performing, by the UE, according to the access time slot and the preamble signature, the random access procedure.
An apparatus, comprising:
- a receiver configured to receive access control information from a base station, wherein the access control information comprises a user equipment identifier and the access control information instructs the apparatus to perform a random access procedure;
- a processor configured to acquire an access time slot and a preamble signature according to the received access control information, wherein the acquiring comprises:
- selecting a highest priority access service class (ASC) from a plurality of pre-configured ASCs wherein each one of the pre-configured ASCs has a different priority, and
- obtaining the access time slot and the preamble signature according to the to the highest priority ASC;
- and
- a transmitter, configured to perform, the random access procedure according to the obtained access time slot and the preamble signature.
The apparatus according to 10, wherein the access time slot and the preamble signature are randomly selected from the set of all available sub-channels and the set of available signatures, respectively.
A communications system, comprising:
- a user equipment (UE) communicatively connected to a base station, wherein the UE is configured to:
- receive access control information from the base station, wherein the access control information comprises an identifier of the UE and instructs the UE to perform a random access procedure;
- select, according to the access control information, a highest priority access service class (ASC) from a plurality of pre-configured ASCs, wherein each one of the pre-configured ASCs has a different priority;
- obtain an access time slot and a preamble signature according to the selected ASC;
- and
- perform the random access procedure by transmitting an access preamble according to the obtained access time slot and the preamble signature.
Dependencies are inferred from the claim text.