CN104125627B - A method and device for transmitting a downlink dedicated physical channel - Google Patents

Abstract

The present invention provides a method and device for transmitting a downlink dedicated physical channel (DPCH). The method includes: judging whether a predetermined condition is met; Otherwise, the pilot of the pilot domain of the downlink dedicated physical channel is sent continuously. The power of the base station can be saved through the present invention.

Description

A method and device for transmitting a downlink dedicated physical channel

technical field

The present invention relates to the field of UMTS (Universal Mobile Telecommunications System, universal mobile communication system), in particular to a method and device for transmitting a downlink dedicated physical channel (DPCH).

Background technique

At present, how to effectively reduce the power loss of the base station has always been a concern of equipment manufacturers and operators. Therefore, the 3GPP protocol provides the downlink CPC (continuous packet connectivity) technology in the R7 version, which saves energy through downlink discontinuous transmission. The transmit power on the base station side improves the system capacity. However, the CPC function defined by the protocol can only be used in pure HSPA (High-Speed Packet Access, high-speed data packet access/access technology), that is, the downlink uses F- DPCH (Fractional Dedicated Physical Channel, some dedicated physical channels), this function requires terminal support of R7 and above protocol versions. At present, there are many ordinary R99, R5 and R6 terminals in the commercial network. These terminals do not support the CPC function. Therefore, based on the current situation, there is no similar technology to save the power of the base station for these terminals, and only the continuous transmission mode can be used. .

Contents of the invention

The technical problem to be solved by the present invention is to provide a downlink dedicated physical channel (DPCH) transmission method and device to save the power of the base station.

In order to solve the above technical problems, the present invention provides a method for transmitting a downlink dedicated physical channel, including:

Judging whether the predetermined conditions are met;

If it is satisfied, the process of discontinuously sending the pilots in the pilot field of the downlink dedicated physical channel is performed; otherwise, the pilots in the pilot field of the downlink dedicated physical channel are continuously sent.

Further, the above method also has the following characteristics: the processing of discontinuously sending the pilot in the pilot field of the downlink dedicated physical channel includes:

periodically sending the pilot of the pilot domain of the downlink dedicated physical channel within a specified period, and performing downlink inner loop power control within the specified period;

During the period when the pilot in the pilot domain of the downlink dedicated physical channel is not sent, the uplink power control command is shielded, and the downlink inner loop power control is not performed.

Further, the above method also has the following characteristics: the predetermined conditions include:

The user service is at least one of the R99 data service and the high-speed downlink packet access service carried on the dedicated physical channel along with the channel, and the data field of the dedicated physical channel has no data to be sent.

Further, the above method also has the following characteristics: in the process of discontinuously sending the pilot of the pilot field of the downlink dedicated physical channel, including:

If it is judged that there is data to be sent in the data field of the dedicated physical channel, a preamble for adjusting power control is sent at a specified period in advance before sending the data, and the pilot of the pilot field of the downlink dedicated physical channel is continuously sent after sending the preamble.

In order to solve the above problems, the present invention also provides a device for processing downlink dedicated physical channel transmission, including:

The first module is used to determine whether a predetermined condition is met;

The second module is configured to discontinuously send the pilot of the pilot field of the downlink dedicated physical channel when the first module judges that it is satisfied;

The third module is configured to continuously send the pilot of the pilot field of the downlink dedicated physical channel when the first module judges that it is not satisfied.

Further, the above-mentioned device also has the following characteristics: the second module includes:

The first unit is configured to periodically send the pilot of the pilot field of the downlink dedicated physical channel within a specified period when the first module judges that it is satisfied, and perform downlink inner loop power control within the specified period;

The second unit is configured to shield the uplink power control command and not perform downlink inner loop power control during the period when the pilot of the pilot domain of the downlink dedicated physical channel is not sent within the period.

Further, the above-mentioned device also has the following characteristics: the predetermined conditions include:

The user service is at least one of the R99 data service and the high-speed downlink packet access service carried on the dedicated physical channel along with the channel, and the data field of the dedicated physical channel has no data to be sent.

Further, the above-mentioned device also has the following characteristics: the second module also includes,

The third unit is used to judge whether there is data to be sent in the data field of the dedicated physical channel, and if so, send a preamble for adjusting power control at a specified period in advance before sending the data, and notify the third module;

The third module continuously sends the pilot of the pilot domain of the downlink dedicated physical channel after receiving the notification.

To sum up, the present invention provides a downlink dedicated physical channel (DPCH) transmission method and device, which can save the power of the base station.

Description of drawings

FIG. 1 is a flowchart of a method for transmitting a downlink DPCH according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a DPCH channel structure defined in the 3gpp protocol.

Fig. 3 is a schematic diagram of a discontinuous transmission mode in a downlink DPCH Pilot field according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the mutual conversion between the discontinuous transmission mode and the continuous transmission mode in the downlink DPCH Pilot domain according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of an apparatus for processing a downlink DPCH according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Fig. 1 is the flow chart of the method for downlink DPCH transmission of the embodiment of the present invention, as shown in Fig. 1, the method of this embodiment comprises:

S11, judging whether the predetermined condition is met, if so, then go to step S12, otherwise go to step S13;

S12. Perform discontinuous transmission of pilots in the pilot domain of the downlink dedicated physical channel;

S13. Continuously send the pilot of the pilot domain of the downlink dedicated physical channel.

According to the method of the embodiment of the present invention, by discontinuously transmitting the downlink DPCH pilot field, when the pre-defined termination condition is met, the transmission of the DPCH pilot field is stopped, and the transmission is not restarted until the pre-defined start condition is met, which can save downlink The transmission power of the dedicated physical channel increases the system capacity.

For example, the discontinuous transmission mode of the DPCH pilot domain is defined as DL_Pilot_DTX, and the base station determines whether the DPCH pilot domain enters the discontinuous transmission mode according to whether DL_Pilot_DTX_Active is activated.

If DL_Pilot_DTX_Active is true, the following conditions must be met at the same time: 1. The user's service is a pure data service, and it is an R99 data service or an HSDPA (High Speed Downlink Packet Access) service carried on the DPCH with a channel, or the two 2. The base station supports DPCH discontinuous transmission mode; 3. No data is sent in the Data (data) field of DPCH, otherwise, DL_Pilot_DTX_Active is false (false).

Higher layers define the pilot domain discontinuous transmission (DL_Pilot_DTX) process through the following parameters.

Pilot_DTX_Cycle: The cycle of the downlink DPCH pilot domain burst pattern (burst pattern), generally in units of frame or time slot.

DL_Pilot_DTX deactivation: When there is data in the Data field of the DPCH, switch from the discontinuous transmission mode in the DPCH pilot field to the continuous transmission mode, and set DL_Pilot_DTX_Active to false.

Pilot_DTX_preamble_length: When there is data to be sent in the Data field of the DPCH, the time length of the preamble (preamble) that needs to be sent in advance in the DPCH pilot field, generally in slot (time slot) unit.

The preamble is mainly used to adjust the power control. No data is sent during the period of sending the preamble, but the downlink power control is performed. In order to make the power control keep up with the channel changes when sending data, to control the SIR (Signal to Interference Ratio, signal to interference ratio) , the number of time slots in advance and the delay time of data are related to performance requirements, which can be determined through simulation or testing.

Pilot_DTX_burst: The burst length of the downlink DPCH pilot field under Pilot_DTX_Cycle, generally in units of frames.

When DL_Pilot_DTX_Active is true, the base station completes the following operations:

The Pilot (pilot) of DPCH is only sent during the burst (burst), and the length of the transmission is Pilot_DTX_burst, and the inner loop power control is performed on the downlink during this period;

The Pilot domain gap (gap) length of DPCH is:

Pilot_DTX_Cycle-Pilot_DTX_burst;

During the gap time, the uplink TPC (power control command) is blocked, and the downlink inner loop power control is not performed.

For example, frame number C of the first burst satisfies the following conditions:

C mod Pilot_DTX_Cycle == 0;

The cycle is in units of frames, which means that the burst is in the first part of the cycle, that is, the pilot of the pilot field of the DPCH is sent at the beginning of the Pilot_DTX_Cycle cycle. Of course, it can also be at other times in this cycle, as long as it is periodic sent.

If the Data field of the DPCH starts to send data in slot S, then the preamble is sent at S-Pilot_DTX_preamble_length. The base station knows that data is to be sent in the slot S Data field. At this time, the preamble is sent ahead of the time slot S by Pilot_DTX_preamble_length. That is to say, the base station knows that there is data to be sent in the Data field in Slot A. At this time, it starts to send the preamble. The length of time for sending is Pilot_DTX_preamble_length. After sending the preamble, it enters the continuous transmission mode of the DPCH Pilot field and starts sending data. At this time, enter the DPCH Pilot field continuous transmission mode, continuously send the DPCH Pilot field and use the uplink TPC command to perform downlink inner-loop power control until the Data field has no data.

In several slots at the beginning of burst and preamble, the downlink power control method may be different from the protocol, such as adopting a smaller step size or ignoring several TPC commands.

For the R99 service, the service is carried on the DPDCH (Dedicated Physical Data Channel, dedicated physical data channel), and the control information is carried on the DPCCH (Dedicated Physical Control Channel, dedicated physical control channel). DPDCH and DPCCH are time-division multiplexed to form a downlink dedicated physical channel (DPCH), as shown in FIG. 2 , where TPC is an inner loop power control command, TFCI is a transport format combination indication, Pilot is a pilot frequency, and Data is data information. When there are few data channel services, at this time, the DPCH basically sends control information, that is, TPC, TFCI, and Pilot.

For the HSDPA service carried by the accompanying channel on DPCH, the service is carried on HSDPA, and the signaling is carried on the Data field of DPCH. When doing services, signaling is generally relatively small, and DPCH basically sends TPC, TFCI, and Pilot.

Figure 2 shows the channel structure of DPCH in the 3gpp protocol. The DPCH wireless frame length is 10ms and contains 15 slots. Each slot contains DPDCH and DPCCH. DPCCH is a control channel, including TPC, TFCI and Pilot fields. DPDCH is Data channel, including the Data field.

Figure 3 shows a schematic diagram of the downlink transmission of the DL_Pilot_DTX mode in the embodiment of the present invention, as shown in Figure 3, when entering the DL_Pilot_DTX mode, that is, DL_Pilot_DTX_Active is true, and the initial CFN (Connection Frame Number, connection frame number )C satisfies (C mod Pilot_DTX_Cycle)==0 and enters burst, starts to send the pilot in the pilot domain of DPCH, and the duration is Pilot_DTX_burst, for example, 1 frame, at this time, the pilot in the pilot domain of DPCH is sent, and the power is used for downlink Control, and then enter the gap, during which the pilot of the pilot domain of the DPCH is not sent. At this time, the duration is Pilot_DTX_Cycle (for example, 4 frames) minus Pilot_DTX_burst. At this time, the uplink TPC command is shielded, and the downlink power control is not performed. At the same time, the pilot in the pilot domain of the DPCH is not sent; later when the CFN satisfies CFN modPilot_DTX_Cycle==0, a burst is sent for a duration of Pilot_DTX_burst.

Figure 4 provides a schematic diagram of an embodiment of switching between a discontinuous transmission mode and a continuous transmission mode in the downlink DPCH Pilot domain, including the following steps:

Step 301. When DL_Pilot_DTX_Active is true and CFN satisfies (CFN mod Pilot_DTX_Cycle)==0, enter burst and start sending pilots in the pilot domain of DPCH. The duration is Pilot_DTX_burst, and the pilots in the pilot domain of DPCH are sent normally , for downlink power control;

Step 302, then enter the gap, at this time, the pilot in the pilot field of the DPCH is not sent, the uplink TPC command is shielded, and the downlink inner loop power control is not performed.

Step 303, when there is data to be sent in the DPCH Data domain at time T, and it is determined to be sent at slot S (the base station can know or set the time of data sending by means such as high-layer notification), at this time DL_Pilot_DTX is deactivated, and DL_Pilot_DTX_Active is false , send the preamble at S-Pilot_DTX_preamble_length, enter the pilot continuous transmission mode until the data in the DPCH Data field is sent;

Step 304, at this time, it is necessary to transmit the Pilot field of the DPCH, and at the same time use the TPC command reported in the uplink to perform downlink power control, start sending data at slot S, and continuously send the Pilot field of the DPCH, and use the TPC command reported in the uplink to perform downlink power control ;

Step 305, after sending the data, judge in the next slot whether to activate DL_Pilot_DTX_Active to be true;

Step 306: After the condition is met, the activation is true, and at this time, the transmission is performed in the DPCH Pilot DTX mode, and the CFN of the first burst satisfies the condition C mod Pilot_DTX_Cycle.

Several slots are started in the preamble and burst, and the downlink power control method may be different from the protocol, such as adopting a smaller step size or ignoring several TPC commands.

FIG. 5 is a schematic diagram of an apparatus for processing a downlink DPCH according to an embodiment of the present invention. As shown in FIG. 5, the apparatus of this embodiment may include:

The first module is used to determine whether a predetermined condition is met;

The second module is configured to discontinuously send the pilot of the pilot field of the downlink dedicated physical channel when the first module judges that it is satisfied;

The third module is configured to continuously send the pilot of the pilot field of the downlink dedicated physical channel when the first module judges that it is not satisfied.

Wherein, the second module may include:

The first unit is configured to periodically send the pilot of the pilot field of the downlink dedicated physical channel within a specified period when the first module judges that it is satisfied, and perform downlink inner loop power control within the specified period;

The second unit is configured to shield the uplink power control command and not perform downlink inner loop power control during the period when the pilot of the pilot field of the downlink dedicated physical channel is not sent within the period.

Among them, the predetermined conditions include:

The user service is at least one of the R99 data service and the high-speed downlink packet access service carried on the dedicated physical channel along with the channel, and the data domain of the dedicated physical channel has no data to be sent.

In a preferred embodiment, the second module may further include,

The third unit is used to judge whether there is data to be sent in the data field of the dedicated physical channel, and if so, send a preamble for adjusting power control at a specified period in advance before sending the data, and notify the third module;

The third module continuously sends the pilot of the pilot domain of the downlink dedicated physical channel after receiving the notification.

The present invention can be realized by using a software system, and can also be realized by using hardware.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

The above are only preferred embodiments of the present invention. Of course, the present invention also has other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various Corresponding changes and modifications, but these corresponding changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (6)

1. A method for transmitting a downlink dedicated physical channel, comprising: Judging whether the predetermined condition is met; the predetermined condition includes: the user service is at least one of the R99 data service and the high-speed downlink packet access service carried by the accompanying channel on the dedicated physical channel, and the data domain of the dedicated physical channel is not to be sent The data; If it is satisfied, the process of discontinuously sending the pilots in the pilot field of the downlink dedicated physical channel is performed; otherwise, the pilots in the pilot field of the downlink dedicated physical channel are continuously sent. 2. The method according to claim 1, characterized in that: the process of discontinuously sending the pilot of the pilot domain of the downlink dedicated physical channel comprises: periodically sending the pilot of the pilot domain of the downlink dedicated physical channel within a specified period, and performing downlink inner loop power control within the specified period; During the period when the pilot in the pilot domain of the downlink dedicated physical channel is not sent, the uplink power control command is shielded, and the downlink inner loop power control is not performed. 3. The method according to claim 1 or 2, characterized in that: in the process of discontinuously sending the pilot of the pilot domain of the downlink dedicated physical channel, comprising: If it is judged that there is data to be sent in the data field of the dedicated physical channel, a preamble for adjusting power control is sent at a specified period in advance before sending the data, and the pilot of the pilot field of the downlink dedicated physical channel is continuously sent after sending the preamble. 4. A device for processing downlink dedicated physical channel transmission, comprising: The first module is used to judge whether the predetermined condition is met; the predetermined condition includes: the user service is at least one of the R99 data service and the high-speed downlink packet access service carried on the dedicated physical channel with the channel, and the dedicated physical channel The data field of has no data to be sent; The second module is configured to discontinuously send the pilot of the pilot field of the downlink dedicated physical channel when the judgment of the first module is satisfied; The third module is configured to continuously send the pilot of the pilot field of the downlink dedicated physical channel when the first module judges that it is not satisfied. 5. The device according to claim 4, wherein the second module comprises: The first unit is configured to periodically send the pilot of the pilot field of the downlink dedicated physical channel within a specified period when the first module judges that it is satisfied, and perform downlink inner loop power control within the specified period; The second unit is configured to shield the uplink power control command and not perform downlink inner loop power control during the period when the pilot of the pilot field of the downlink dedicated physical channel is not sent within the period. 6. The device according to claim 4 or 5, characterized in that: the second module further comprises, The third unit is used to judge whether there is data to be sent in the data field of the dedicated physical channel, and if so, send a preamble for adjusting power control at a specified period in advance before sending the data, and notify the third module; The third module continuously sends the pilot of the pilot domain of the downlink dedicated physical channel after receiving the notification.