CN1192513C

CN1192513C - Method for controlling downward special physical channel power under compressed mode

Info

Publication number: CN1192513C
Application number: CNB011402830A
Authority: CN
Inventors: 陈磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2001-12-12
Filing date: 2001-12-12
Publication date: 2005-03-09
Anticipated expiration: 2021-12-12
Also published as: CN1426172A

Abstract

The present invention discloses a method for controlling downlink dedicated physical channel power under a compressed mode, and the key of the method is that when adopting a compressed mode, the uplink dedicated physical channel (DPCH) first sends transmit power control (TPC) bits before the pilot bits of a first time slot after an interval time slot are sent. By using the method, a base station can recover the control of the transmit power after the interval time slot, so that the time needed in the process that an actual SIR value approaches a target SIR value is reduced, and therefore, the transmission quality of signals is improved.

Description

The method of under a kind of compact model downward special physical channel power being controlled

Technical field

The present invention relates to the channel power control technology, refer to a kind of structure of time slot that under compact model, passes through to change uplink special physical channel (DPCH) especially, realize the method that descending DPCH channel power is controlled.

Background of invention

Generally, the DPCH channel comprises Dedicated Physical Data Channel (DPDCH) and Dedicated Physical Control Channel (DPCCH), the DPCH channel has two kinds of transformats: normal mode and compact model, channel is continuous when transmitting with normal mode, and channel will interrupt a period of time during with compressed mode transmission, promptly have (gap) time slot at interval, originally the data of transmitting at the gap time slot position respectively the legacy data before gap or behind the gap after overcompression, transmit.Usually, up DPCH channel time slot structure under the compact model as shown in Figure 1, wherein each time slot of DPCCH channel comprises: pilot tone (pilot) territory, transformat merge indication (TFCI) territory, feedback information (FBI) territory and transmitting power control (TPC) territory.Descending DPCH channel under the compact model has two kinds of structure of time slot: first kind as shown in Figure 2, each time slot comprises data 1 (Data1) territory, TPC territory, TFCI territory, data 2 (Data2) territory and pilot tone (PL successively, pilot) there is transmission intercal (transmission gap) time slot in territory between data slot.Second kind as shown in Figure 3, the whole structure of time slot of this descending DPCH channel distributes and the composition of each time slot and first kind of descending DPCH channel basic identical, just the TPC territory of DPCCH channel has increased the TPC bit in first gap time slot, is used for controlling the transmitting power of first time slot behind the up channel gap.

In order to guarantee the transmission quality of data, need control the transmitting power of adjusting down link by power usually.According to the agreement regulation, the detailed process of downlink inner loop power control is such:

At first, subscriber equipment (UE) carries out signal interference ratio (SIR) to the pilot bit in the current time slots among the descending DPCCH to be measured, and the outer shroud target SIR value of measurement result and setting is in advance compared; Then, UE determines TPC value simultaneously according to the TPC order that result relatively produces the control descending power, and in the time slot of subsequently a up DPCCH channel this TPC is ordered and the TPC value passes to the base station; After base station node B receives this ascending time slot,, adjust a nearest time slot DPCH channel transmitting power according to TPC order wherein.Further say and be exactly: base station node B is after receiving the TPC order that up DPCCH channel sends, will be according to TPC value and the relevant information transmitted in this TPC order, from the distance current time nearest also not the pilot bit of the descending DPCH channel of transmission begin down transmitting power is adjusted.For the adjustment of descending DPCH channel power, not the zero hour from a time slot, data1 bit promptly shown in Figure 2 carries out, but begin to carry out from the pilot bit of previous time slot.

In above-mentioned inner loop power control procedure, when the structure of time slot of up DPCH channel is in compact model, as shown in Figure 1, because the existence of transmission gap time slot will cause the TPC order to transmit, at this moment base station node B will stop the inner loop power control procedure, till having new up TPC order to pass to base station node B.

Cooperate shown in Figure 4ly, can illustrate in greater detail the reason that TPC can't transmit.Fig. 4 is in uplink and downlink DPCH channel time slot corresponding relation figure under the compact model for the UE antenna side, and in Fig. 4, the time slot of filling with oblique line is a data slot; Blank time slot is the gap time slot; The part of filling with grid is the pilot bit in last gap time slot; The nonoverlapping zone of gap in shown A and B region representation up channel and the down channel.

According to normal condition, promptly under the normal transmission pattern, the TPC bit in the ascending time slot 1 shown in Figure 4 is used to control the power of descending time slot 3 (or descending time slot 4, when the delay of inner loop power control is two time slots).And when up channel and down channel use compact model simultaneously, because the existence of pilot bit in the descending DPCH channel time slot 4, UE can carry out sir measurement to the pilot bit of this time slot, and the TPC that produces the adjustment of control base station power orders, but because ascending time slot 4 is in gap, therefore this TPC order of UE generation can't be transmitted by up channel, so, just causes descending time slot 6 (or descending time slot 7) to fail to carry out the power adjustment.When up channel uses compact model and down channel when using non-compact model, same, the normal TPC order that produces of descending DPCH channel is because up DPCH channel current time slots is a gap time slot and can't transmit new TPC and order to the base station.Convalescent purpose is exactly after the gap: in order to reduce as early as possible because actual sir value that power control interruption causes during the gap and the deviation between the target SIR value, but, make the base station behind gap, could begin to carry out power control during the 3rd (or the 4th) time slot owing to reason recited above.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method for under a kind of compact model downward special physical channel power being controlled, make the base station can behind gap, recover control as early as possible to transmitting power, be worth the time of required cost thereby reduce actual sir value near target SIR, and then improve signal transfer quality.

Another object of the present invention is to: when up channel is in compact model, and down channel can further be optimized descending power control when being in non-compact model.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

To the method for downward special physical channel power control, this method may further comprise the steps at least under a kind of compact model:

When uplink special physical channel adopts compact model, before the pilot bits of first time slot behind each transmission intercal sends, send tpc bit;

The base station is adjusted the channel power of downward special physical channel after receiving the pilot bits and the tpc bit before the pilot bits that uplink special physical channel is sent immediately.Wherein, the transmitting power of described tpc bit according to each transmission intercal of uplink special physical channel after the transmitting power of first time slot determine that method determines.

This method further comprises: when descending DPCH adopts compact model, send tpc bit on the transmitting power control domain position in first transmission intercal.

By such scheme as can be seen, key of the present invention is: increase the TPC bit in last gap time slot of up DPCCH channel, carry out the control of downlink closed-loop power to carry previous time slot, improve link performance.

As seen, the method of under the compact model provided by the present invention downward special physical channel power being controlled, when uplink and downlink DPCH channel uses compact model simultaneously, in last gap time slot of up DPCCH channel, increase the TPC bit, can make the base station in convalescence, carry previous time slot and carry out the control of downlink closed-loop power, thereby accelerate the process that actual sir value approaches the target SIR value, improve link performance, improve signal transmission quality.

Even when having only up DPCH channel to use compact model, in last gap time slot of up DPCCH channel, increase the TPC bit, carry out closed power control owing to carry previous time slot equally, can realize the optimization of descending power control, further improve link performance.

Description of drawings

Fig. 1 is a up DPCH channel time slot structural representation under the compact model in the prior art;

Fig. 2 is a kind of structure of time slot schematic diagram of descending DPCH channel under the compact model in the prior art;

Fig. 3 is the another kind of structure of time slot schematic diagram of descending DPCH channel under the compact model in the prior art;

Fig. 4 is uplink and downlink compact model corresponding relation figure in the prior art;

Fig. 5 is up DPCH channel time slot structural representation under the compact model among the present invention.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

When up DPCH channel uses compact model, want to shorten the process that actual sir value approaches the target SIR value, think to recover as early as possible power control to descending DPCH channel, the new TPC that just needs up DPCCH channel can transmit current descending DPCH channel generation before gap finishes orders to the base station, so, as shown in Figure 5, in last gap time slot of up DPCCH channel Transmission gap, increase the TPC bit, can make the base station carry previous time slot and carry out closed power control.

The present invention can't reduce the effective time that is actually used in different-frequency measure among the gap to the change of up DPCCH channel time slot structure.So-called different-frequency measure just is meant: when UE prepares to carry out direct-cut operation, when promptly switching to other frequency different with current frequency, in advance the frequency that will switch to be measured.Because the relevant parameter of compact model all is consistent to up link and down link, therefore, when system used compact model together in up link and down link, the corresponding relation that can draw the up send channel of UE end and descending receive channel as shown in Figure 4.Actual as can be seen in the drawings effectively frequency switch area promptly can be used for time period of different-frequency measure, is less than the physical length of gap.If from down channel, at last several bits place of about preceding half time slot He last gap time slot of first gap time slot, in fact the reception of antenna or transmission frequency still rest on current area.Not carry out the purpose that frequency switches be will wait the signal of up channel current time slots to send to finish to preceding half time slot of first gap time slot among the down channel gap, because the A district among Fig. 4 in fact still rests in the current area, therefore can be used to send some data, in this case, descending DPCH channel just can adopt second kind of structure of time slot shown in Figure 3, promptly the TPC territory of DPCCH channel increases the TPC bit in first gap time slot, transmit the TPC bit with this time period, with the power of first time slot behind the gap in the control up channel.Equally, because at several bits place, the back of last gap time slot of up channel, B district as shown in Figure 4, in fact the antenna of UE has switched go back to this sub-district, therefore can be at last time slot of up channel gap, be that ascending time slot 4 places add one section TPC bit among Fig. 4, so just can in corresponding ascending time slot, uploading, thereby adjust the transmitting power of a downlink time slots more according to the resulting TPC bit of the sir measurement result of pilot bit in the down channel time slot 4.

The present invention can be applied to the compact model power control in the WCDMA communication system, and concrete implementation process is as follows:

When up channel and down channel all adopted compact model, then up DPCH channel adopted time slot format of the present invention, in the end increased the TPC bit in a gaP time slot that is:.At this moment UE carries out sir measurement to the pilot bit in last gap time slot in the descending DPCH channel, and compare with the target SIR value, then comparative result is sent with the TPC bit that increases in last gap time slot of up DPCH channel, so, just can carry previous time slot and begin inner loop power control, reduce because there is the influence to inner loop power control in gap.

When having only up channel to use compact model, and down channel is when adopting normal mode, because the temporary transient blank parts length of interrupting being vacated of transfer of data is exactly Measuring Time length, blank parts is long more, the time that can be used for measuring is just long more, so, additionally adding the TPC bit will cause Measuring Time to reduce.Therefore, according to practical situations, if to the requirement of inner loop power control greater than requirement to effective Measuring Time length, then up DPCH channel also adopts time slot format of the present invention.

Wherein, the transmitting power of the TPC bit that is increased can determine that method determines according to the transmitting power of first time slot behind the up DPCH channel gap that stipulates in 3GPP TS 25.214 agreements.

Claims

1, the method for under a kind of compact model downward special physical channel power being controlled is characterized in that this method may further comprise the steps at least:

The base station is adjusted the channel power of downward special physical channel after receiving the pilot bits and the tpc bit before the pilot bits that uplink special physical channel is sent immediately.

2, method according to claim 1 is characterized in that, this method further comprises: when descending DPCH adopts compact model, send tpc bit on the transmitting power control domain position in first transmission intercal.

3, method according to claim 1 is characterized in that, the transmitting power of described tpc bit according to each transmission intercal of uplink special physical channel after the transmitting power of first time slot determine that method determines.