Method and apparatus for performing random access procedure

a random access and wireless communication technology, applied in the direction of power management, wireless communication, assess restriction, etc., can solve the problems of lack of resources in the 4g wireless communication system to meet the growing demand for high speed data services, ineffective current mechanism, and failure to achieve prach preamble transmission. , to achieve the effect of higher data rates

Inactive Publication Date: 2018-11-01
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0018]Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the

Problems solved by technology

However, the 4G wireless communication system suffers from lack of resources to meet the growing demand for high speed data services.
After sending the SI request, like any other transmission it is possible that the SI request transmission fails or it is possible that the SI request transmission is su

Method used

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  • Method and apparatus for performing random access procedure
  • Method and apparatus for performing random access procedure

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embodiment 5

[0124]In another embodiment of the disclosure, scaling factor for random access backoff is specified corresponding to retransmission attempt number (or based PREAMBLE_TRANSMISSION_COUNTER).

[0125]FIG. 9 illustrates an operation for RA backoff according to an embodiment of the disclosure.

[0126]Similar to Embodiments 1 to 4, during the random access procedure, the UE transmits a PRACH preamble at operation 910, and then waits for RAR in the RAR window corresponding to its RACH preamble transmission. If the network (e.g. gNB) wants the UE to back off the network sends backoff parameter value (or index to predefined list of backoff values) in RAR at operation 920. Alternately, if the network wants the UE to back off the network sends backoff indicator at operation 920, and backoff parameter is pre-defined or signaled in SI. If the UE receives backoff parameter value (or index to predefined list of backoff values) or indication to backoff in RAR, the UE sets backoff scaling factor corresp...

embodiment 6

[0139]In an embodiment of the disclosure, the UE skip backoff for certain events (e.g. high priority services such as URLLC or handover or beam failure recovery, etc.), even if the UE has received the indication to back off in RAR.

POWER RAMPING MECHANISM

[0140]During the random access procedure, the UE first transmits the PRACH preamble and then waits for RAR in the RAR window corresponding to its RACH preamble transmission. Sometimes due to congestion on PRACH channel, PRACH preamble transmission may not be successful. If the UE does not receive the RAR corresponding to its PRACH preamble transmission during the RAR window, the UE retransmits the PRACH preamble. During the retransmission the UE ramps up the power by PowerRampingStep. PowerRampingStep is signaled in SI. All the UEs apply same PowerRampingStep. This is not efficient as latency requirement may be different for different UEs. The latency requirement may be different depending on event which triggered random access proce...

embodiment 1

[0141]In one embodiment of the disclosure, PowerRampingStep parameter for RA is specified for each access category. There can be several access categories. An access category corresponds to a UE / device type and / or service type and / or call type and / or signaling type and / or application ID and / or slice type and / or slice ID and / or combination of one or more of UE / device type, service type, call type, signaling type or application type or slice type or slice ID.

[0142]FIG. 10 illustrates an operation for power ramping according to an embodiment of the disclosure.

[0143]Referring to FIG. 10, the mapping between PowerRampingStep parameter and access category is signaled (either using periodic broadcast or on demand) by network (e.g. gNB) in SI at operation 1010. For example, gNB may transmit system information indicating that PowerRampingStep for Access Category 1 is PowerRampingStep X, PowerRampingStep for Access Category 2 is PowerRampingStep Y, and so on. The mapping between PowerRampingS...

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Abstract

A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for internet of things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of a terminal for performing a random access procedure is provided. The method includes transmitting a random access preamble associated with a random access procedure to a base station, receiving a random access response including information on a backoff parameter value from the base station, identifying a scaling factor for backoff based on a priority of the random access procedure or an event which triggers the random access procedure, determining a random backoff time based on the scaling factor and the backoff parameter value, and transmitting a subsequent random access preamble after the random backoff time to the base station.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This application is based on and claims priority under 35 U.S.C. § 119 of an Indian patent application number 201731014799, filed on Apr. 26, 2017, in the Indian Patent Office, the disclosure of which is incorporated by reference herein in its entirety.BACKGROUND1. Field[0002]The disclosure relates to a system, a method and an apparatus for performing a random access procedure in a wireless communication system. More particularly, the disclosure relates to a method for on demand system information (SI) acquisition error handling, a random access (RA) backoff method and a power ramping method.2. Description of Related Art[0003]To meet the demand for wireless data traffic having increased since deployment of fourth generation (4G) communication systems, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘beyond 4G network’ or...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W52/36
CPCH04W74/0833H04W52/36H04W52/325H04W52/50H04W74/008H04W74/085H04W48/14H04W48/12H04W74/0875
Inventor AGIWAL, ANILINGALE, MANGESH ABHIMANYU
Owner SAMSUNG ELECTRONICS CO LTD
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