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Method and apparatus for PCDP discard

An entity, timer technology, applied in the direction of error prevention/detection using return channel, digital transmission system, wireless network protocol, etc., can solve the problem of PDCP SDU transmission time-out, invalid, etc.

Active Publication Date: 2015-08-05
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in some cases, such as when scheduled data has a long delay, some PDCP SDUs become stale or invalid for transmission because their delay has exceeded the maximum allowed by their Quality of Service (QoS) profile

Method used

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  • Method and apparatus for PCDP discard
  • Method and apparatus for PCDP discard
  • Method and apparatus for PCDP discard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0062] According to an embodiment, the transmitting PDCP entity initiates the PDCP SDU discard operation based on one or more of the following events or triggers: (1) The SDU / PDU discard timer expires (or the specific time interval elapses or is exhausted); (2) Receive a notification from the RLC sublayer below; (3) Receive a PDCP status report from a peer PDCP entity.

[0063] The elapsed time (time interval) is measured from the occurrence time of a reference event such as receiving an SDU from an upper layer (variant 1), or submitting an SDU / PDU to a lower layer (variant 2). Other variants of the reference event include storing the packet in the buffer, removing the packet from the buffer, or performing a specific PDCP process, function, or action on the packet. If a certain (pre-configured) time threshold is exhausted, the packet will be dropped.

[0064] The following describes alternative ways of implementing timer-based discard operations.

[0065] When / once the SDU is recei...

Embodiment approach 1

[0135] Embodiment 1: Before inserting the SDU into the PDCP transmit buffer, the transmitting PDCP entity allocates a PDCP SN. Figure 5 Illustrated is a transmitting PDCP entity, which is configured to allocate a PDCP SN to an SDU at 510 before buffering at 520.

Embodiment approach 2

[0136] Embodiment 2: After removing the SDU from the PDCP transmit buffer, the transmitting PDCP entity allocates a PDCP SN. Image 6 Illustrated is a transmitting PDCP entity, which is configured to allocate a PDCP SN to an SDU at 620 after buffering at 610.

[0137] Figure 5 with Image 6 The embodiment shown in the figure shows specific PDCP functions, but we should understand that even if the PDCP sublayer functions are changed and modified, the disclosed content can be applied. When additional functions are added to the PDCP sublayer, the disclosed content Can still apply.

[0138] The following describes the mechanism of discarding PDCP SDU signaling (also referred to as PDCP SDU discarding with explicit signaling). When a PDCP SDU is discarded (due to a discard timer, or other discard trigger), the transmitting PDCP entity sends a signaling message to the receiving PDCP entity to notify its SDU(s) to be discarded. The receiving PDCP entity adjusts / affects its operation acco...

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PUM

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Abstract

A method and apparatus for discarding a packet data convergence protocol (PDCP) service data unit (SDU) are disclosed. A PDCP layer sets a timer and discards a PDCP SDU upon expiration of the timer. The timer may be set upon receiving the PDCP SDU from an upper layer or upon submitting the PDCP SDU to a lower layer for transmission. The timer and a radio link control (RLC) discard timer may be coordinated. Alternatively, the PDCP layer may discard the PDCP SDU based on a notification from an RLC layer or based on a PDCP status report.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of September 29, 2008, an application number of 200880109903.6, and an invention title of "Method and Device for PDCP Discarding". Technical field [0002] The present invention relates to wireless communication. technical background [0003] The 3rd Generation Partnership Project (3GPP) has launched the Long Term Evolution (LTE) project to bring new technologies, new network architectures and configurations, and new applications and services to wireless cellular networks, thereby providing better services at a lower cost. High spectrum efficiency, reduced time delay, faster user experience and richer applications and services. [0004] The LTE architecture protocol includes multiple layers. Figure 1 illustrates the user plane protocol stack of the LTE architecture. Layer 1 is the physical layer (PHY). The PHY provides information transfer services to higher layers through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W28/02H04L12/823H04L12/841H04L29/08H04L47/32
CPCH04L1/188H04L1/1874H04W80/02H04L47/32H04W28/0205H04L69/324H04L69/28H04L47/283H04L1/1812H04W28/06H04L69/04
Inventor M·萨摩尔S·E·泰利
Owner INTERDIGITAL PATENT HLDG INC