CN1996779A - A method for measuring the load of the public physical channel - Google Patents

Abstract

The invention discloses a method for measuring the load of a common physical channel, including a method for measuring the load on the downlink common physical channel SCCPCH and the load on the uplink common physical channel PRACH, and its core includes: mapping the common transport channel to a common physical channel above; weighing the load of the common physical channel according to factors affecting the number of bits on the common physical channel. Through the present invention, no matter whether there is continuous transmission of information on the public physical channel, the load on the public physical channel can be effectively measured.

Description

Method to measure common physical channel load

technical field

The invention relates to the field of communication, in particular to a public physical channel load measurement technology.

Background technique

As shown in Figure 1, a schematic diagram of RRC (Radio resource control, radio resource control) state and state transition in a 3G WCDMA system is given. It can be seen that the RRC state of the user is divided into link mode and idle mode, and the link mode is divided into Divided into Cell-DCH (Cell Dedicated channel, cell dedicated channel), Cell-FACH (Cell Forward access channel, cell forward access channel), Cell-PCH (Cell Paging channel, cell paging channel), URA-PCH ( URA Pagingchannel, registration area paging channel) status.

Both the CELL-DCH state and the CELL-FACH state can transmit data. The difference between them is: when the user is in the Cell-DCH state, a dedicated channel is specially allocated for the user, and this dedicated channel is used by a single user; When the user is in the Cell-FACH state, the transmission data of multiple users can be carried on the common transmission channel. Wherein the common transmission channel is divided into an uplink common transmission channel and a downlink common transmission channel. When transmitting data in the downlink, the user transmits data using the SCCPCH (Secondary Common Control Physical channel, secondary common control physical channel); when transmitting data in the uplink, the user transmits data using the PRACH (PhysicalRandom access channel, physical random access channel). Since the user uses the public physical channel to transmit data, any user can use it. However, the capacity of the public physical channel is limited. When too many users need to send data, the channel will be congested, making the data not available in time. Therefore, user data needs to be controlled according to the load on the physical channel to avoid channel congestion. Since the above-mentioned public physical channels are all in the NodeB (base station), and the RNC (base station controller) controls the transmission of user data, it is necessary for the RNC to know the load situation of the public physical channel on the NodeB, so as to User data is controlled by the load on the network.

The prior art related to the present invention provides the concept of Acknowledged PRACH preambles (Physical Random Access Channel Confirmation Preamble) in the standard protocol, and its core is: define Acknowledged PRACH preambles as issued by each access frame on a PRACH Confirm the lead. When users transmit uplink data, all users can use PRACH to access NodeB. After NodeB receives the data on PRACH, it sends Acknowledged PRACH preambles information to the corresponding connected users.

It can be seen from the above-mentioned technical solutions of the prior art that since the standard protocol defines AcknowledgedPRACH preambles as the acknowledgment preambles issued by each access frame on a PRACH, the preambles should be issued first every time information is transmitted on the PRACH Acknowledgments, the number of preamble acknowledgments sent can roughly reflect the number of simultaneous access users on the PRACH, that is to say, it can roughly reflect the load on the PRACH. However, when the uninterrupted information transmission starts on the PRACH, the acknowledgment preamble will not be issued, unless the acknowledgment preamble is issued when the information is transmitted again after interruption. From this point of view, there will be the following technical problems:

When information is continuously transmitted on the common physical channel, the load on the common physical channel cannot be fully reflected only according to the value of the number of AcknowledgedPRACH preambles sent by the NodeB, so user data cannot be effectively controlled according to the load information on the common physical channel transmission.

Contents of the invention

The purpose of the present invention is to provide a method for measuring the load of the common physical channel, so as to effectively reflect the load of the common physical channel, and then effectively control the data transmission on the common physical channel according to the load.

A kind of method for measuring public physical channel load described in the present invention comprises:

A. The base station controller RNC maps the common transport channel to the common physical channel;

B. Measuring the load of the common physical channel according to factors affecting the number of bits on the common physical channel.

Wherein, the step A specifically includes:

When transmitting data downlink, the RNC maps multiple downlink common transport channels to a secondary common control physical channel SCCPCH;

or,

When transmitting data uplink, the RNC maps an uplink common transport channel to a physical random access channel PRACH.

Wherein, when data is transmitted downlink, the factors affecting the number of bits on the common physical channel include:

The number of bits corresponding to the transport format combination TFC corresponding to the common transport channel.

Wherein, when transmitting data downlink, the factors affecting the number of bits on the common physical channel also include:

Encoding the number of bits of the incoming common physical channel, and/or rate matching the number of bits of the incoming common physical channel.

Wherein, when transmitting data uplink, the factors affecting the number of bits on the common physical channel include:

The maximum number of bits that can be carried on the common transport channel RACH corresponding to the common physical channel within one transmission time interval TTI, and the number of bits transmitted on the RACH within one TTI.

Wherein, when transmitting data downlink, the step B specifically includes:

B1, measure the load on the SCCPCH according to the number of bits corresponding to the transport format combination TFC corresponding to the common transport channel;

or,

B2, measure the load on the SCCPCH according to the bit number corresponding to the TFC corresponding to the common transport channel and the bit number of the common physical channel introduced by encoding;

or,

B3. Measure the load on the SCCPCH physical channel according to the number of bits corresponding to the TFC corresponding to the common transport channel, and the number of bits of the common physical channel introduced by encoding and rate matching.

Wherein, described step B1 specifically comprises:

B11. The RNC finds out the corresponding number of bits configured for the maximum TFC according to the transport format combination set TFCS supported on the public physical channel; and calculates and obtains the TFC information issued in the current TTI through the TFC information issued in the current TTI The number of bits corresponding to the TFC;

B12. The RNC calculates and obtains the load of the current public physical channel according to the number of bits corresponding to the TFC delivered in the current TTI and the corresponding number of bits configured for the maximum TFC.

Wherein, the step B2 specifically includes:

B21. RNC calculates the number of TFCI bits that can be carried on the SCCPCH according to the spreading factor, the number of pilot field pilot bits in each time slot, and the number of transmission format combination indication TFCI bits in each time slot. The number of data bits;

B22, according to the number of bits corresponding to the TFC of the public transport channel and the impact of encoding on the number of bits in the corresponding public physical channel, calculate the number of bits in a wireless frame after the current TFC is converted to the public physical channel;

B23. Calculate and obtain the load on the current SCCPCH according to the number of data bits that can be carried by each radio frame that can be carried on the calculated SCCPCH and the number of bits on a radio frame after the current TFC is converted to the common physical channel .

Wherein, the step B3 specifically includes:

B31. RNC calculates the number of TFCI bits that can be carried on the SCCPCH according to the spreading factor, the number of pilot field pilot bits in each time slot, and the number of transmission format combination indication TFCI bits in each time slot. The number of data bits;

B32, calculate the number of bits on a wireless frame after the current TFC is converted to the common physical channel according to the corresponding bit quantity, coding and rate matching of the TFC of the common transport channel;

B33, calculate and obtain the load on the current SCCPCH according to the number of data bits that can be carried by each radio frame that can be carried on the calculated SCCPCH and the number of bits on a radio frame after the current TFC is converted to the physical channel.

Wherein, when transmitting data uplink, the step B specifically includes:

B4, RNC obtains the maximum number of bits that each RACH can transmit in the subdistrict within a TTI time according to the PRACH number configured for each cell, and the maximum bit rate that the RACH corresponding to each PRACH can transmit; and count a The number of bits actually transmitted on the corresponding RACH within the TTI time;

B5. Calculate and obtain the load of the current uplink public physical channel of the cell according to the obtained maximum number of bits that can be transmitted by one RACH within one TTI time and the counted number of bits actually transmitted on the corresponding RACH within one TTI time value.

The beneficial effects of the present invention are as follows:

As can be seen from the above-mentioned technical scheme of the present invention, compared with the prior art, the present invention first maps the common transport channel to the common physical channel; then utilizes the factors that affect the number of bits on the common physical channel to measure the common The load of the physical channel can effectively reflect the load situation on the public physical channel regardless of whether there is continuous information transmission on the public physical channel, so that the transmission of user data can be controlled according to the load situation on the public physical channel.

Description of drawings

Fig. 1 is a schematic diagram of RRC state and state transition;

Fig. 2 is the flowchart of the first embodiment provided by the present invention;

Fig. 3 is a flow chart of the second embodiment provided by the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with each other.

The first embodiment provided by the present invention is a method for measuring the load on the downlink public physical channel, and its specific implementation process is shown in Figure 2, including:

Step 1: Map multiple downlink common transport channels to one common physical channel.

For example, in a WCDMA system, the type of transmission channel used to transmit downlink data is the FACH channel. There can be multiple FACH channels. Some FACH channels are used to transmit signaling information data, and some FACH channels are used to transmit data. Yes, different FACH channels map different types of logical channels, the logical channel types include: CTCH (Common traffic channel, common traffic channel), CCCH (Common control channel, common control channel), DTCH (Dedicated traffic channel, dedicated service channel), DCCH (Dedicated control channel, dedicated control channel). The transmission format, RMA (Rate Match Attribute, rate matching attribute) and encoding method of the FACH channel mapped to different types of logical channels are different. For example, as shown in Table 1:

transmission channel Transmission format CRC length Encoding type RMA TTI mapped logical channel FACH 0×168bits1×168bits2×168bits 16bits CC, 1/2 220 10ms CCCH/DCCH FACH 0×360bits1×360bits 16bits TC 160 10ms DTCH FACH 0×168bits1×168bits 16bits CC, 1/3 220 10ms CTCH

Table 1

Map multiple downlink FACH channels used for data transmission to one SCCPCH (Secondary common control physical channel, secondary common control physical channel). In this way, the factors affecting the number of bits on the common physical channel may include the transmission format, RMA, or coding mode of the common transport channel mapped to the common physical channel.

Step 2, using factors affecting the number of bits on the common physical channel to measure the load on the common physical channel.

There are three processing methods in step 2, wherein the first one is: only measure the load on the SCCPCH according to the number of Bits (bits) corresponding to the TFC (Transport format combine, transmission format combination) of the public transport channel. Its core is: first calculate the TFCS (Transport format combine set) supported on the SCCPCH, and find the maximum TFC in the TFCS, and then calculate the number of Bits corresponding to the maximum TFC; then calculate the current TTI (transmissionTime Interval, transmission time interval), the number of Bits corresponding to the TFC used in the delivery; finally, the load on the current SCCPCH is calculated according to the number of Bits corresponding to the calculated maximum TFC and the number of Bits corresponding to the TFC issued in the current TTI. The specific implementation process is as follows:

In step 211, the RNC finds out the maximum TFC, ie TFC _max , according to the configured TFCS information supported on the SCCPCH, and obtains the number of bits corresponding to the TFC _max according to the number of bits configured by the RNC for each TFC.

Step 212: Obtain the TFC information delivered in the current TTI according to the TFCs that can be delivered in a TTI, and calculate and obtain the Bit number corresponding to the TFC delivered in the current TTI according to the TFC information.

Step 213, calculate the load value on the current SCCPCH according to the Bit number corresponding to the maximum TFC obtained in step 211 and the corresponding Bit number of the TFC issued in the current TTI in step 212, as shown in formula (1):

The load value on the current SCCPCH = the number of bits corresponding to the issued TFC in the current TTI / the number of bits corresponding to TFC _max (1)

It can be seen that the ratio of the number of bits corresponding to the TFC issued by each TTI to the number of bits corresponding to the TFC _max is the load value of the SCCPCH.

The second implementation method of step 2 is based on the first method and combines the number of bits of the public physical channel introduced by encoding to measure the load on the SCCPCH. Its core is: first calculate the number N _SF of data bits that can be carried by each wireless frame that can be carried on the SCCPCH; then according to the number of Bits corresponding to the TFC of the public transport channel and the code pair corresponding to the public physical channel bit Calculate the number of bits on a wireless frame after the current TFC is converted to the public physical channel; finally, according to the calculated number of data bits N _SF that can be carried by each wireless frame that can be carried on the SCCPCH and the current TFC Calculate the number of bits on a radio frame after conversion to the common physical channel and obtain the load on the current SCCPCH. The specific implementation process of the second method includes:

Step 311, according to spreading factor, pilot (pilot domain) bit number in every time slot and TFCI (transport format combination indication) bit number in every time slot, calculate the number that each radio frame on the SCCPCH can carry Number of data bits N _SF .

The number N _SF of data bits that can be carried by each radio frame on the S-CCPCH can be calculated by formula (2):

N _SF ＝2×38400/SF-(N _pilot +N _TFCI )×15 (2)

Wherein, SF is a spreading factor, N _pilot is the number of pilot bits in each time slot, and N _TFCI is the number of TFCI bits in each time slot.

Since the "flexible location" multiplexing method is generally used when configuring the SCCPCH, the TFCI bits (TFCIPresence=EXISTS) on the SCCPCH should also be configured, as given in the standard 25.211, generally when SF=128～256, N _TFCI =2 , when SF=4-64, N _TFCI =8.

Step 312: Calculate the number of bits in a wireless frame after the current TFC is converted to the public physical channel according to the influence of the transmission format combination and coding on the corresponding public physical channel bit number.

After the downlink public transport channels corresponding to different TFCs are mapped to SCCPCH, the corresponding number of public physical channel bits may be introduced by encoding. The following is the calculation of the current TFC for the case of the number of bits introduced on the public physical channel. The number of bits on the frame:

First, calculate the length of the concatenation after the transmission block is appended with the CRC check according to the formula (3):

CON_SIZE＝TB_NUM×(TB_SIZE+CRC_SIZE) (3)

Among them, TB_NUM and TB_SIZE are the number of transport blocks and the transport block size (bits) of the transport format, respectively, and CRC_SIZE is the additional CRC bit length (0, 8, 12, 16, or 24 bits);

Then, according to the concatenated length value after the CRC check of the transport block calculated by using the formula (3), and the channel coding type and coding rate of the transport channel i (CODE_RATE, the value is 1/2 or 1/3, only for Convolutional code is valid), calculate the bit length change value ENCODE_LENGTH brought about by encoding:

The specific calculation process is as follows:

IF convolutional coding, THEN

Z=504

CB_NUM=upper(CON_SIZE/Z)

IF CB_NUM=0, THEN

CB_SIZE=0

ELSE

CB_SIZE=upper(CON_SIZE/CB_NUM)

END IF

ENCODE_LENGTH＝CB_NUM×(CB_SIZE+8)/CODE_RATE

ELSE IF TURBO encoding, THEN

Z=5114

CB_NUM=upper(CON_SIZE/Z)

IF CB_NUM==0, THEN

CB_SIZE=0

ELSE IF CON_SIZE＜40, THEN

CB_SIZE=40

ELSE

CB_SIZE＝upper(CON_SIZE/CB_NUM)

END

ENCODE_LENGTH＝CB_NUM×(CB_SIZE×3+12)

END IF

After the above-mentioned processing process, the number of bits of the common physical channel introduced due to encoding is calculated and the bit length change value ENCODE_LENGTH brought about by encoding is obtained, and then the number of bits on the common physical channel is calculated and obtained according to the ENCODE_LENGTH, thus reflecting Described common physical channel, i.e. the load situation on SCCPCH, concrete implementation process is as follows:

Utilize the repetition factor corresponding to the transmission channel i calculated by formula (4) to calculate the number of bits on the radio frame corresponding to the transmission format combination TFCj to obtain the number of bits on a radio frame after the current TFC is converted to the common physical channel, and the formula ( 4) as follows:

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; TFC</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; I</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; R</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, N _{i, j} is the number of bits converted to each wireless frame before the rate matching of the common physical channel i in TFCj, which is the ENCODE LENGTH calculated in step 312; the RFi is the bit rate matching on the common physical channel The influence value of the number, because this factor is not considered here, the RFi is 1.

The number of bits on the wireless frame corresponding to the transmission format combination TFCj obtained by calculating the bit length change value caused by the encoding through the above calculation process, that is, the number of bits on a wireless frame after the current TFC is converted to the public physical channel.

Finally, according to the number N _SF of data bits that can be carried by each radio frame on the SCCPCH calculated in step 311, and the current TFC calculated in step 312 is converted to the number of bits on the next radio frame of the common physical channel, Calculate and obtain the load on the current SCCPCH, as shown in formula (5):

${\mathrm{<span\; class="notranslate">\; load</span>}}_{\mathrm{<span\; class="notranslate">\; sccpch</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; TFC</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; SF</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Wherein, the N _TFCj is the number of bits in a radio frame after the current TFC is converted to the common physical channel; the _NSF is the number of data bits that can be carried by each radio frame on the SCCPCH.

The third method of measuring the load on the current SCCPCH in step 2 not only considers the number of bits corresponding to the TFC of the transport channel and the impact of encoding on the number of bits of the corresponding physical channel, but also considers the impact of rate matching on the corresponding public physical channel The influence of the number of bits, its core is: first calculate the number N _SF of data bits that can be carried by each wireless frame that can be carried on the SCCPCH; The impact of the corresponding number of public physical channel bits calculates the number of bits on a wireless frame after the current TFC is converted to the public physical channel; finally, according to the calculated number of data bits N that can be carried by each wireless frame that can be carried on the SCCPCH _{The SF} and the current TFC are converted to the number of bits on a radio frame after the common physical channel is calculated and the load on the current SCCPCH is obtained. The specific implementation process is as follows:

Step 411, calculate the number N _SF of data bits that can be carried by each radio frame on the SCCPCH according to the spreading factor, the number of pilot bits in each time slot, and the number of TFCI bits in each time slot.

The specific implementation process of this step is similar to step 311 in the second method, and will not be described in detail here.

Step 412: Calculate the number of bits in a radio frame converted from the current TFC to the public physical channel according to the influence of the transmission format combination, encoding and rate matching on the corresponding number of bits of the public physical channel.

After different TFCs are mapped to SCCPCH, the number of corresponding physical channel bits is introduced by encoding on the one hand, and is caused by rate matching in the common physical channel processing process on the other hand. The following calculates the number of bits on a wireless frame after the current TFC is converted to the public physical channel for these two cases:

First, calculate the bit length change value caused by encoding for the number of common physical channel bits introduced by encoding:

Step 4121, still according to the formula (3) to calculate the length of the concatenation after the CRC check of the transport block:

CON_SIZE＝TB_NUM×(TB_SIZE+CRC_SIZE) (3)

Among them, TB_NUM and TB_SIZE are the number of transport blocks and the transport block size (bits) of the transport format, respectively, and CRC_SIZE is the additional CRC bit length (0, 8, 12, 16, or 24 bits);

Step 4122, according to the concatenated length value after the CRC check of the transmission block obtained in step 4121, and the channel coding type and coding rate (CODE_RATE, value 1/2 or 1/3 of the transmission channel i, only for convolution code is valid), calculate the bit length change value ENCODE_LENGTH brought about by encoding. The specific implementation process is similar to the relevant description in the second method, and will not be described in detail here.

After the above processing, the bit number of the public physical channel introduced only by encoding is calculated and the bit length change value ENCODE_LENGTH brought by the encoding is obtained, and then the bit length brought by the rate matching is calculated for the bit number of the common physical channel introduced by the rate matching Variation value:

Step 4123, according to the number N _SF of data bits that can be carried by each radio frame on the SCCPCH obtained in step 411, and the ENCODE_LENGTH calculated in step 4122, use the formula in the protocol 25.212 to calculate the flexible configuration mode. The repetition factor corresponding to the transmission channel i, as shown in formula (6):

$\mathrm{<span\; class="notranslate">\; R</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; \&Element;</span>\mathrm{<span\; class="notranslate">\; TFCS</span>}}{\mathrm{<span\; class="notranslate">\; max</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; I</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; R</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; SF</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Where RM _i is the rate matching factor corresponding to the common transmission channel; N _{i, j} is the number of bits converted to each wireless frame of the common transmission channel i in TFCj before rate matching, which is the ENCODE_LENGTH calculated in step 4122; the formula The denominator in refers to in TFCS, each public transport channel RM (i) * N (i, j) and the maximum value; N _SF is the data bit that each wireless frame on the SCCPCH calculated in step 411 can carry number.

Step 4124: Calculate the number of bits in the radio frame corresponding to the transport format combination TFCj according to the repetition factor corresponding to the common transport channel i obtained in step 4123, that is, the number of bits in the radio frame after the current TFC is converted to the common physical channel. The calculation is still as shown in formula (4), namely:

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; TFC</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; I</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; R</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

After the above calculation of the number of common physical channel bits introduced by encoding, the bit length change value caused by encoding is obtained, and the transmission format combination TFCj corresponding to the wireless frame is obtained by combining the calculation of the number of common physical channel bits introduced by rate matching. The number of bits, that is, the number of bits on a radio frame after the current TFC is converted to the common physical channel.

Finally, according to formula (5), that is, according to the calculated number N _SF of data bits that can be carried by each radio frame on the SCCPCH, and the number of bits on a radio frame after the current TFC is converted to the public physical channel And get the load on the current SCCPCH, as follows:

${\mathrm{<span\; class="notranslate">\; load</span>}}_{\mathrm{<span\; class="notranslate">\; sccpch</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; TFC</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; SF</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Wherein, the N _TFCj is the number of bits in a radio frame after the current TFC is converted to the common physical channel; the _NSF is the number of data bits that can be carried by each radio frame on the SCCPCH.

The above describes the process of measuring the load of the downlink common physical channel, and the type of the common physical channel used for uplink data transmission is PRACH, and one cell can support multiple PRACHs. When measuring the load of the uplink public physical channel, it can be realized by the second embodiment provided by the present invention, and its core is: first map each RACH to a PRACH respectively, and then calculate a TTI time on the public physical channel The maximum number of bits that can be carried on the corresponding RACH; then count the number of bits transmitted on the RACH within one TTI time; finally, according to the maximum number of bits that can be carried on the RACH within one TTI time and one TTI time on the RACH The number of transmitted bits calculates the load on the current RACH, and the obtained RACH load is the PRACH load. The specific implementation process is shown in Figure 3, including the following steps:

Step 101, each RACH is mapped to a PRACH respectively;

Step 102, measure the load on the physical channel according to the factors affecting the number of bits on the common physical channel.

Since the factors affecting the number of bits on the uplink public physical channel are mainly the maximum number of bits that can be transmitted by one RACH within one TTI and the number of bits actually transmitted on the RACH within one TTI, the specific implementation process of step 102 is as follows: :

The RNC first obtains the maximum number of bits that can be transmitted by one RACH within one TTI according to the number of PRACHs configured for each cell and the maximum bit rate that can be transmitted by one PRACH. Then, it counts the number of bits actually transmitted on the RACH within one TTI.

In step 102, the RNC can obtain the number of bits actually transmitted on each RACH through data transmission with the NodeB.

Finally, the RNC uses formula (6) to calculate the load of the current uplink common transmission channel of the cell according to the maximum number of bits that can be transmitted by one RACH within one TTI time and the number of bits actually transmitted on the RACH within one TTI time value.

The current RACH load = the number of bits actually transmitted on the RACH in one TTI time/the maximum number of bits that can be transmitted on the RACH in one TTI time. (6)

As can be seen from the specific implementation scheme provided by the present invention above, the present invention first maps the public transport channel to the public physical channel by the RNC; then utilizes the factors that affect the number of bits on the public physical channel to measure the Load, which solves the problem in the prior art that when information is continuously transmitted on the physical channel, the load condition carried on the public physical channel cannot be effectively reflected according to the value of the Acknowledged PRACH preambles sent by the NodeB, resulting in that the public physical channel The technical problem that the load on the public physical channel cannot effectively control the transmission of user data realizes that regardless of whether there is continuous information transmission on the public physical channel, the load on the public physical channel can be measured in the RNC, and then can be based on the The load condition on the common physical channel is used to effectively control the transmission of user data.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1, a kind of method of weighing public physical signal channel load is characterized in that, comprising:

A, Common transport channel is mapped on the public physic channel;

B, weigh the load of described public physic channel according to the factor of the bit number of influence on the described public physic channel.

2, the method for claim 1 is characterized in that, described steps A specifically comprises:

When downlink transmission data, base station controller RNC is mapped to many downlink common transport channel FACH on the secondary Common Control Physical Channel SCCPCH;

Or,

When uplink transmission data, RNC is mapped to a up Common transport channel RACH on the Physical Random Access Channel PRACH.

3, the method for claim 1 is characterized in that, when downlink transmission data, the factor of the bit number on the described public physic channel of described influence comprises:

The bit number of the transformat combination TFC correspondence of Common transport channel correspondence.

4, method as claimed in claim 3 is characterized in that, the factor of the bit number on the described public physic channel of described influence also comprises:

The bit number of the public physic channel that coding is introduced, and/or, the bit number of the public physic channel that rate-matched is introduced.

5, the method for claim 1 is characterized in that, when uplink transmission data, the factor of the bit number on the described public physic channel of described influence comprises:

The maximum number bits that institute can carry on the Common transport channel RACH corresponding with described public physic channel in Transmission Time Interval TTI time, and, the bit number that transmits on inherent described RACH of TTI time.

6, method as claimed in claim 4, described step B specifically comprises:

B1, weigh load on the SCCPCH according to the bit number of the transformat combination TFC correspondence of described Common transport channel correspondence;

Or,

The bit number of B2, the public physic channel introduced according to the bit number and the coding of the TFC correspondence of described Common transport channel correspondence is weighed the load on the SCCPCH;

Or,

The bit number of the public physic channel that B3, the bit number according to the TFC correspondence of described Common transport channel correspondence, coding and rate-matched are introduced is weighed the load on the SCCPCH.

7, method as claimed in claim 6 is characterized in that, described step B1 specifically comprises:

B11, RNC find out the bit number of the correspondence that disposes into maximum TFC according to the transport format combination set TFCS that is supported on the described public physic channel; And, by the bit number of the TFC information calculations that issued in the current TTI and the TFC correspondence that obtains issuing in the current TTI;

B12, RNC are according to the bit number of the TFC correspondence that issues in the described current TTI and the load of calculating and obtain current public physic channel for the bit number of the correspondence of maximum TFC configuration.

8, method as claimed in claim 6 is characterized in that, described step B2 specifically comprises:

B21, RNC calculate institute's energy data carried by data number of bits on each radio frames that can carry on the SCCPCH according to pilot field pilot number of bits in spreading factor, the every time slot and the indication of the transformat combination in every time slot TFCI number of bits;

The bit number of B22, the public physic channel introduced according to the amount of bits and the coding of the TFC correspondence of Common transport channel calculates current TFC and converts behind the public physic channel bit number on the radio frames;

B23, according to each radio frames that can carry on the SCCPCH that calculates energy data carried by data number of bits and current TFC convert behind the public physic channel bit number calculating on the radio frames and obtain load on the current SCCPCH.

9, method as claimed in claim 6 is characterized in that, described step B3 specifically comprises:

B31, RNC calculate institute's energy data carried by data number of bits on each radio frames that can carry on the SCCPCH according to pilot field pilot number of bits in spreading factor, the every time slot and the indication of the transformat combination in every time slot TFCI number of bits;

The bit number of the public physic channel that B32, the amount of bits according to the TFC correspondence of Common transport channel, coding and rate-matched are introduced calculates current TFC and converts behind the public physic channel bit number on the radio frames;

B33, according to each radio frames on carrying on the SCCPCH that calculates energy data carried by data number of bits and current TFC convert behind the public physic channel bit number calculating on the radio frames and obtain load on the current SCCPCH.

As right 1,2 or 5 described methods, it is characterized in that 10, when uplink transmission data, described step B specifically comprises:

B4, RNC be according to be the PRACH number of each cell configuration, and the RACH of each the PRACH correspondence maximum bit rate that can transmit obtain each RACH in the interior described sub-district of a TTI time the maximum number bits that can transmit; And add up the bit number that inherent corresponding RACH of TTI time goes up actual transmissions;

B5, according to a resulting TTI in the time RACH the maximum number bits that can transmit and the inherent corresponding RACH of a TTI time that added up go up the bit number of actual transmissions, calculate and obtain the load value of the current up public physic channel of described sub-district.