CN1464653A - Method for setting upgoing shared channel in communication system - Google Patents

Abstract

The invention discloses a process for initializing uplink shared communication channel in the communication system. In the time division duplex TDD communication system of the asymmetric grouping service, the uplink and downlink resources usually use asymmetric design in which more resources are allocated to downlinks, and uplink resources are in short supply. The process provided in the invention makes full use of the limited uplink resources by setting uplink shared channel in the communication system, thus providing uplink data, physical layer signaling and high layer signaling service for a plurality of mobile terminal UEs having relative small uplink traffic volume.

Description

The method to set up of Uplink Shared Channel in a kind of communication system

Technical field

The present invention relates to 3-G (Generation Three mobile communication system) 3G enhancement techniques, the cellular high speed packet access technique.Especially at the TDD system of asymmetric Packet Service.

Background technology

In serving the TDD communication system of asymmetric data business, in general, for the down high speed business is provided better, the downgoing time resource allocation is more, and the resource that is used for uplink is fewer.And in the less uplink time period of distributing, need provide all user equipment (UE)s of this sub-district up user data, high-level signaling and physical layer signaling.Browse and business such as FTP for WWW, the UE most of the time need not send upstream data.Even there is upstream data to send, it is also very little to send data volume.If system is each state of activation UE assigned with dedicated channel, then can reduces resource utilization greatly, and then cause up transmission bottleneck.

If adopt Random Access Channel RACH mode to send upstream data, packet of then every transmission all will carry out following three steps:

1) the leading transmission request of UE ascending pilot channel (UpPTS),

2) wireless Internet base station (WIB) issues indication by descending physical access channel (FPACH),

3) the up physical access channel of UE (PRACH) sends message.

When a plurality of packet of up transmission once, need repeatedly carry out first two steps, promptly UpPTS and FPACH send, and expense is bigger.And, insert the conflict that also needs to consider usually between the UE at random.Both passed high-level signaling at RACH, and passed the design of user data again, with respect to the design of only transmitting high-level signaling message, conflict can obviously increase.Fig. 1 is the physical layer subframe Subframe structure of a kind of cellular high speed packet access technique CHPA, and its uplink only has time slot of TS1 as can be seen, and all the other time slot TS0, TS2, TS3, TS4 all are used for downlink transfer, and ascending resource is at full stretch.

Summary of the invention

At above-mentioned shortcoming, the present invention proposes the method to set up of Uplink Shared Channel in a kind of communication system, this method defines one or more of USCH, when each UE need transmit data, wireless access network distributes corresponding transmission time sheet based on subframe, UE uploads data and signaling message in this timeslice (frame or subframe), realizes discharging resource when timeslice finishes automatically.

The present invention is achieved in that

The method to set up of Uplink Shared Channel in a kind of communication system, this method may further comprise the steps,

Definition at least one USCH on a, the up channel in system;

B, when needing transmit ascending data, send up signaling by RACH at a travelling carriage (UE), requiring WIB is that this UE distributes the USCH channel resource;

C, this WIB distribute the USCH channel resource according to the request of radio channel resource and all UE at present;

D, this WIB issue the USCH configuration parameter of this UE by DSCH Downlink Shared Channel (DSCH) or FACH;

E, this UE send data according to the USCH configuration parameter on the corresponding frame of USCH, stop to send when legal time finishes.

This USCH need define spreading factor and channel code number, and spreading factor can be different in different systems with channel number.Many situation is identical, whether defines more USCH, decides on last resource of this time slot and UE number.Access Network can be broadcasted the parameter configuration situation of these USCH channels, comprises ascending time slot, spreading factor, channel number.

USCH channel resource parameter comprises the data volume of UE uplink this time and the data rate of this transmitting uplink data of UE.Data rate is an option, if the data rate of USCH is constant, then can not be with this parameter.If the USCH rate-compatible then can be according to the predetermined upstream data rate of current measured value.

USCH configuration parameter in the steps d comprises, repetition period (Repetition Period), repeat length (RepetitionLength), side-play amount (Offset) and effective concluding time (Valid Time).This repetition period refers to a set time section T, and unit is frame or subframe usually.This repeat length refers to the shared time L of this UE in one-period, and unit is frame or subframe usually.This side-play amount (Offset) refers to the relative position Offset that this UE begins to send in one-period, and unit is frame or subframe usually.This effective concluding time (Valid Time) can be an end mark with the absolute time system frame number SFN, stops to send after arriving this SFN, and perhaps also available relative time N stops to send at N all after date.

Data among the step e send and stop according to following method:

(1) when nearest system-frame satisfies SFN mod T=Offset, start to send, launch continuously to suspend behind the repeat length L frame and send;

(2) when next cycle satisfies SFN mod T=Offset, start transmission once more, launch continuously to suspend behind the repeat length L frame and send;

(3) when equaling absolute effective time, System Frame Number stops up transmission.

Because the professional UE uplink data sending in PS territory off and on, the present invention has saved ascending wireless resource greatly with respect to the dedicated channel scheme.With respect to using the RACH scheme, each upstream data bag all needs a UpPTS, FPACH, and three steps of PRACH are inserted.But under a plurality of packet situations, saved first two steps, promptly only needed this step of PRACH can realize that data insert.

Description of drawings

Fig. 1 is the physical layer subframe Subframe structure of cellular high speed packet access technique CHPA.

Fig. 2 is that the up USCH channel of UE sends schematic diagram data.

Embodiment

Below in conjunction with drawings and Examples the present invention is described in further detail.

In the present embodiment, current C HPA sub-district has only defined a Uplink Shared Channel USCH.Have two travelling carriages need upload data at present, UE1 has 10 packets, and UE2 has 4 packets.If the current time is SFN=4090 (scope of SFN is 0.4095, understands delivery 4096 again after surpassing), so UE1 and UE2 all begin to send upstream data behind SFN=0.

At first, UE1 and UE2 are its allocation of channel resources may by up RACH request WIB respectively.

WIB dispatches according to the priority of current resource situation, UE, the measured value of each UE, and the USCH configuration parameter is handed down to UE1 and UE2 respectively from DSCH or FACH, and its concrete configuration parameter sees the following form.

UE1, the UE2 time-division parameter list on USCH

	UE1	?UE2
			Repetition period
	8	?16
			Repeat length	3	?2
Side-play amount	2	?6
			Effective concluding time	27	?24

As shown in Figure 2, the operation of UE1 after receiving this configuration parameter is such:

(m) (SFN=2) begins to send upstream data when nearest SFN mod 8=2, and (being SFN=5) suspends transmission after sending repeat length 3 frames continuously.

(2) start transmission once more at next SFN mod 8=2 (SFN=10), and (being SFN=13) suspends transmission after sending repeat length 3 frames continuously.

(3) start transmission once more at next SFN mod 8=2 (SFN=18), and (being SFN=21) suspends transmission after sending repeat length 3 frames continuously.

(4) start transmission once more at next SFN mod 8=2 (SFN=26), when SFN=effective concluding time (SFN=27), finish upstream data and send.In fact, the part of SFN=27 to 29 has not belonged to the UE1 resource, and WIB can distribute to it other UE.

Also as shown in Figure 2, the operation of UE2 after receiving this configuration parameter is to above-mentioned similar:

(1) (SFN=6) begins to send when nearest SFN mod 16=6, and (being SFN=5) suspends transmission after sending repeat length 2 frames continuously.

(2) start transmission once more at next SFN mod 16=6 (SFN=22), and (being SFN=24) suspends transmission after sending repeat length 2 frames continuously.Because SFN=24 is effective concluding time, so UE2 stops up transmission.

As Fig. 2 at SFN=0-2,5-6, the time period of 13-18 does not belong to UE1 and UE2, WIB can distribute to it other UE, does not draw among the figure.

Claims (9)

1, the method to set up of Uplink Shared Channel in a kind of communication system is characterized in that, said method comprising the steps of,

Definition at least one Uplink Shared Channel (USCH) on a, the up channel in system;

H, at a travelling carriage (UE) when needing transmit ascending data, (RACH) sends up signaling by Random Access Channel, requires wireless Internet base station (WIB) to distribute the USCH channel resource for described UE;

C, described WIB distribute the USCH channel resource according to the request of radio channel resource and all UE at present;

D, described WIB issue the USCH configuration parameter of this UE by DSCH Downlink Shared Channel (DSCH) or FACH;

E, described UE send data according to the USCH configuration parameter on the corresponding frame of USCH, stop to send when legal time finishes.

2, the method to set up of Uplink Shared Channel in a kind of communication system as claimed in claim 1, it is further characterized in that, described USCH need define spreading factor and channel code number.

3, the method to set up of Uplink Shared Channel in a kind of communication system as claimed in claim 1, it is further characterized in that USCH channel resource parameter comprises the data volume of UE uplink this time and the data rate of UE uplink this time.

4, the method to set up of Uplink Shared Channel in a kind of communication system as claimed in claim 3, it is further characterized in that data rate is an option, if the data rate of USCH is constant, then can not be with this parameter; If the USCH rate-compatible then can be according to the predetermined upstream data rate of current measured value to USCH speed.

5, the method to set up of Uplink Shared Channel in a kind of communication system as claimed in claim 1, it is further characterized in that described USCH configuration parameter comprises repetition period (Repetition Period), repeat length (RepetitionLength), side-play amount (Offset) and effective concluding time (Valid Time).

6, the method to set up of Uplink Shared Channel in a kind of communication system as claimed in claim 5, it is further characterized in that described repeat length refers to the shared time L of described UE in one-period, unit is frame or subframe usually.

7, in a kind of communication system as claimed in claim 5 the method to set up of Uplink Shared Channel its be further characterized in that, described side-play amount (Offset) refers to that described UE begins to send the skew of the position of data with respect to original position in one-period, and unit is frame or subframe usually.

8, in a kind of communication system as claimed in claim 5 the method to set up of Uplink Shared Channel its be further characterized in that, described effective concluding time can be an end mark with the absolute time system frame number SFN, after arriving this SFN, stop to send, perhaps also available relative time N stops to send at N all after date.

9, in a kind of communication system as claimed in claim 1 the method to set up of Uplink Shared Channel its be further characterized in that data among the step e send and stop according to following method:

(1) when nearest system-frame satisfies SFN mod T=Offset, start to send, launch continuously to suspend behind the repeat length L frame and send;

(2) when next cycle satisfies SFN mod T=Offset, start transmission once more, launch continuously to suspend behind the repeat length L frame and send;

(3) when equaling absolute effective time, System Frame Number stops up transmission.

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