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MAC pdu signaling and operating methods for access class barring and back-off control for large-scale radio access network

A technology for signal transmission and media access control, applied in wireless network protocols, machine-to-machine/machine-type communication services, access restrictions, etc., to solve problems that are not fully resolved, cannot provide appropriate solutions, etc.

Inactive Publication Date: 2013-05-01
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the related art does not adequately address these issues and thus cannot provide an adequate solution

Method used

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  • MAC pdu signaling and operating methods for access class barring and back-off control for large-scale radio access network
  • MAC pdu signaling and operating methods for access class barring and back-off control for large-scale radio access network
  • MAC pdu signaling and operating methods for access class barring and back-off control for large-scale radio access network

Examples

Experimental program
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no. 1 approach

[0044] An example of the first embodiment procedure of the UE (in idle mode) when session initiation is requested will be described.

[0045] Step 1) SIB reception: UE receives System Information Block (SIB). Specifically, the UE reads a System Information Block (SIB) (ie, SIB2: SIB Type 2) to identify Random Access (RA) parameters.

[0046] Step 2) Access Class Barring (ACB) Status Check: After reading SIB2, the UE checks the Access Class Barring (ACB) status, whether the UE class is barred.

[0047] Step 3) The subsequent process of the first embodiment can be described in the following order, as understood by those skilled in the art:

[0048] The UE initiates this procedure when the upper layer requests to establish an RRC connection when the UE is in RRC_IDLE. When initiating the procedure, the UE shall:

[0049] 1> If the UE is establishing an RRC connection for a mobile terminating call:

[0050] 2>…

[0051] 1> else if UE is establishing RRC connection for emergen...

no. 2 approach

[0078] The basic purpose of using Access Class Barring (ACB) and Backoff Control (BOC) is to prevent a subset of MTC devices from requesting session initiation and by restricting those MTC devices with Random Access Response (RAR) failures to apply a longer backoff period, respectively. Reduce RACH load to a certain level. From an intuitive point of view, ACB and BOC serve the same purpose of reducing the RACH load for a given time interval. However, their effects differ in two ways:

[0079] 1) The magnitude of latency in ACB (as of the current specification) is measured in seconds, from 4 seconds to 512 seconds; however, the magnitude of latency is measured in milliseconds in BOC, from 4ms to 912ms.

[0080] 2) Compared with BOC, ACB tries a smaller amount of RACH services (under the same waiting (failure) time period).

[0081] In the second embodiment, the MAC PDU structure itself can be changed to help both the H2H device (human UE) and the MAC device to recognize the c...

no. 3 approach

[0112] Some new back-off interval (BI) settings for MTC support may be implemented. The magnitude of the latency for ACB is measured in seconds, from 4 seconds to 512 seconds; however, for BOC, the latency is measured in milliseconds, from 4ms to 912ms. Thus, it can be appreciated that the use of ACB has a greater impact on prohibiting MTC devices from attempting random access since MTC devices have to wait for a longer period of time.

[0113] As in the third embodiment Figure 8 As shown, by introducing longer back-off intervals (BI) for indices 13, 14, and 15, the previously proposed "impact" gap can be reduced.

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Abstract

A scheme for Medium Access Control (MAC) Protocol Data Unit (PDU) signaling includes the steps of receiving, from a Machine-Type Communication (MTC) device, a random access preamble; sending, to the MTC device, a random access response that includes a MAC PDU having a MAC header that includes information for MTC support; receiving, from the MTC device, a scheduled transmission; and performing contention resolution with the MTC device. The information for MTC support can be achieved by: (1) the MAC PDU structure being modified to include a new section used for MTC devices to identify the congestion status of MTC family; (2) providing the backoff control (BOC) with a new sequence of a large-scale backoff interval (BI); (3) changing the random access (RA) procedure for MTC devices; or (4) performing toggling or switching between access class barring (ACB) and backoff control (BOC).

Description

technical field [0001] The embodiments described here relate to the Random Access (or Random Access Channel: RACH) procedure. Background technique [0002] In the related art, certain aspects related to the RACH procedure are problematic because machine-type communication (MTC) for large cellular networks is not properly considered. Therefore, the related art does not sufficiently address these problems, and thus fails to provide an appropriate solution. Contents of the invention [0003] Technical solutions [0004] The present invention recognizes at least the above-mentioned deficiencies of the related art. Based on this recognition, the various features described below have been conceived to enable certain procedures related to the random access procedure to be performed more efficiently and effectively. Specifically, machine type communication (MTC) for large cellular networks can be improved by: (1) modifying the MAC PDU structure to include a new section for MTC...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04W74/08H04L29/08
CPCH04W74/0833H04W48/06H04W74/006H04W4/70H04W80/02
Inventor 李起东金相局
Owner LG ELECTRONICS INC
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