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.
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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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