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Downlink data scheduling method and system

A technology of downlink data and scheduling method, applied in the direction of electrical components, wireless communication, etc., can solve the problems of downlink data transmission delay, downlink data not being scheduled in time, waste of uplink resources, etc., and achieve the effect of timely scheduling

Active Publication Date: 2010-10-27
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the non-contention random access process caused by the arrival of downlink data, since the UL grant must be used to indicate the allocation of uplink resources, it is likely that there is no uplink data to be sent at this time, which wastes uplink resources; and what is needed at this time is to perform downlink Resource indication, since Msg2 can only carry uplink resource indication, the downlink data to be sent cannot be scheduled in time, which causes downlink data transmission delay

Method used

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Experimental program
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Embodiment 1

[0052] The changes to Msg2 in this embodiment include: for the scenario of non-contention random access triggered by the arrival of downlink data, in Msg2, the UL grant indication field included in the MAC RAR is only used to indicate downlink resource allocation, but not to indicate uplink resource allocation , at this time, the UL grant in Msg2 can be represented by DLAssignment.

[0053] In the non-contention random access process, after the UE receives Msg0 on the PDCCH, it can know that the current non-contention random access scenario is triggered by the arrival of downlink data. In this scenario, the UL grant indication field in Msg2 is only used for To indicate downlink resource allocation, the UE receives the Msg2 sent by the eNB, and can know the downlink resource allocation according to the UL grant in Msg2.

[0054] The structure of MAC RAR is shown in Table 3:

[0055]

[0056] Table 3MAC RAR structure

[0057] The meanings of each field of MAC RAR in Table 3...

Embodiment 2

[0066] The changes to Msg2 in this embodiment include: in Msg2, the UL grant indication field contained in the MAC RAR is multiplexed to indicate downlink resource allocation, that is, it can be used not only to indicate downlink resource allocation, but also to indicate uplink resource allocation. At this time, Msg2 The UL grant in can be represented by UL grant / DL Assignment; the R bit is the scheduling direction indication, which is used to indicate whether the UL grant indicates downlink resource allocation or uplink resource allocation. In this case, the R bit in Msg2 is represented by R1. In this case, the structure of MAC RAR is shown in Table 5.

[0067]

[0068] Table 5MAC RAR structure

[0069] The meanings of each field of MAC RAR in Table 5 are:

[0070] -RI: Scheduling direction indication, here, assume that 0 indicates that the UL Grant / DL Assignment field is used to indicate the downlink resource allocation (UL Grant), and 1 indicates that the UL Grant / DL As...

Embodiment 3

[0081] In this embodiment, the format of Msg2 is not changed, and the eNB uses the PDCCH to indicate downlink resources and transmit downlink data at a certain moment corresponding to Msg2; after receiving the downlink resource allocation, the UE confirms that the UL grant in Msg2 is invalid, and does not send the corresponding uplink transmission. If the UL grant in Msg2 is originally valid, the eNB can allocate the resources allocated by Msg2 to other UEs.

[0082] see figure 2 , which is a flow chart of downlink data scheduling in this embodiment, which includes the following steps:

[0083] Step 201: eNB sends Msg0 to UE by using PDCCH.

[0084] Msg0 includes a dedicated preamble code and a PRACH indication allocated for the UE.

[0085] In step 202, the UE sends a dedicated preamble code on the PRACH.

[0086] The dedicated preamble code sent is represented as Msg1.

[0087] In step 203, the eNB sends Msg2 on the downlink carrier after receiving the dedicated preamb...

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Abstract

The invention discloses a downlink data scheduling method and a system. The method comprises the following steps: a base station transmitting a dedicated preamble and a physical random access channel (PRACH) to terminal UE through a physical downlink control channel (PDCCH); and the base station conducting downlink resource indication after the base station receives the dedicated preamble transmitted by the UE on the PRACH. By adopting the technical scheme, the invention realizes the timely scheduling of downlink data.

Description

technical field [0001] The invention relates to data scheduling technology, in particular to a downlink data scheduling method and system. Background technique [0002] In the long-term evolution communication standard (LTE, Long Term Evolution) system, when the base station (eNB, eNodeB) has downlink data arriving, it needs to directly schedule the terminal (UE, User Equipment), and the downlink data scheduling process directly sends the downlink data to the UE through the eNB The resource indication is implemented. After receiving the downlink resource indication, the UE receives the downlink data transmitted by the eNB according to the downlink resource allocation. [0003] However, if the eNB has downlink data arriving, it cannot directly schedule the UE. For example, if the UE is currently in the uplink out-of-sync state, the UE will not be able to receive the downlink resource indication issued by the eNB in ​​time, resulting in the eNB being unable to transmit the dow...

Claims

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Application Information

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IPC IPC(8): H04W72/12H04W74/08
Inventor 谌丽李国庆许芳丽
Owner DATANG MOBILE COMM EQUIP CO LTD
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