CN1138431C - Distribution method for memory space in baseband processing of mobile communication system base station - Google Patents
Distribution method for memory space in baseband processing of mobile communication system base station Download PDFInfo
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- CN1138431C CN1138431C CNB991273389A CN99127338A CN1138431C CN 1138431 C CN1138431 C CN 1138431C CN B991273389 A CNB991273389 A CN B991273389A CN 99127338 A CN99127338 A CN 99127338A CN 1138431 C CN1138431 C CN 1138431C
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Abstract
The present invention relates to an allocation method for memory space in the baseband processing of a mobile communication system base station, which is used for allocating memory space needed when eight time-division multiplexing time slots on a radio frequency signal are processed in a baseband mode. Memory space with a size of C1 is allocated to each of the time slots 0, 2, 4, 6, and memory space with a size of C2 is allocated to each of the time slots 1, 3, 5, 7, or memory space with a size of MAX (C1+D1, C2+D2, C3+D3) is allocated to each time slot. The present invention can make the allocation in the baseband processing more flexible, the memory space occupied by the eight time slots is greatly reduced, and the cost of the mobile communication system base station is reduced.
Description
The present invention relates to mobile communication system (GSM) digital cellular mobile communication systems, especially relate to the distribution method of memory space in a kind of base stations in mobile communication system Base-Band Processing.
The GSM digital cellular mobile communication systems are a time division multiple access (TDMA) systems.In this system, radiofrequency signal time division multiplexing between 8 users, so base stations in mobile communication system need be handled time-multiplexed all 8 time division multiplexing time slots (time slot) on this radiofrequency signal simultaneously when handling a radiofrequency signal.And each time division multiplexing time slot all corresponding a kind of channel combination (channelcombination).This corresponding relation just configures when the initialization of base station.The Base-Band Processing that the channel combination that the GSM base station each time slot correspondence is done mainly is a channel decoding, and this processing is normally finished by one or more DSP (Digital Signal Processing) chip.Because the GSM base station at most simultaneously will be to time-multiplexed 8 channel group cooperation Base-Band Processing in the radiofrequency signal, this just requires dsp chip to store all required information of Base-Band Processing of 8 channel combinations simultaneously, therefore need be at the internal memory or the special memory space of peripheral hardware memory allocation of dsp chip.
In gsm system second stage standard, stipulated seven kinds of channel combinations, these seven kinds of channel combinations are respectively:
(i) main BCCH channel combination is made up of each logic channel of FCCH, SCH, BCCH and CCCH;
(ii) expand the combination of BCCH channel, form by BCCH and each logic channel of CCCH;
(iii) make up the combination of BCCH channel, form by each subchannel of FCCH, SCH, each logic channel of BCCH, CCCH and SDCCH/4, SACCH/C4;
(iv) SDCCH/8 channel combination is made up of each subchannel of SDCCH/8, SACCH/C8;
(v) traffic channel full rate combination is made up of TCH/F, FACCH/F and each logic channel of SACCH/TF;
(vi) the half rate combination one, is made up of TCH/H, FACCH/H and each logic channel of SACCH/TH;
(vii) the half rate combination two, are made up of TCH/H, FACCH/H and each logic channel of SACCH/TH.
Wherein, above-mentioned each English Chinese implication of writing a Chinese character in simplified form is as follows:
BCCH. Broadcast Control Channel
CCCH: Common Control Channel
FACCH/F: with TCH/F with the road fast with path channels
FACCH/H: with TCH/H with the road fast with path channels
FCCH: frequency correction channel
SACCH: slow associated control channel
SACCH/C4: with the slow associated control channel of SDCCH/4 with the road
SACCH/C8: with the slow associated control channel of SDCCH/8 with the road
SACCH/TF: with TCH/F with the road at a slow speed with path channels
SACCH/TH: with TCH/H with the road at a slow speed with path channels
SCH: synchronizing channel
SDCCH/4: the Separate Dedicated Control Channel that is used in combination with BCCH/CCCH
SDCCH/8: Separate Dedicated Control Channel
TCH: Traffic Channel
TCH/F: traffic channel full rate
TCH/H: half rate
These seven kinds of channel combinations can be divided into three classes: be the first kind (i) and (ii), abbreviate Broadcast Control Channel (BCCH) composite class as; Be second class (iii) and (iv), abbreviate Separate Dedicated Control Channel (SDCCH) composite class as; (v), (vi) and (be the 3rd class vii), abbreviate Traffic Channel (TCH) composite class as.
The memory space of first kind BCCH channel composite class needs the temporary variable etc. of paging information formation, immediate assignment message formation, chnnel coding inputoutput buffer and some other BCCH channel of memory channel public attribute, each paging group, and establishing its required storage size is C1.
The memory space of the second class SDCCH channel composite class needs the information of memory channel public attribute, chnnel coding inputoutput buffer, 8 SDCCH subchannels and the temporary variable of some other BCCH channel etc.If (iii), then need to store information, paging information formation, immediate assignment message formation and some other temporary variable etc. of 8 SDCCH subchannels, establishing its required storage size is C2.
The memory space of the 3rd class TCH channel composite class needs the temporary variable of memory channel public attribute, dedicated channel system message, chnnel coding inputoutput buffer and some other TCH channel etc., and establishing its required storage size is C3.
From the size of memory space, C1＞C2＞C3.
Because the base-band software of GSM base station is when making memory allocation to each time slot, and do not know corresponding relation between the combination of each time slot and channel, that is to say, can not be in advance regularly to the memory space of each time slot allocation C1 or C2 or C3 size, so base-band software will consider dynamically that each time slot all may be designated as above-mentioned any channel combination.
Existing distribution method is all to distribute the required memory space of a kind of channel combination of required memory space maximum in all channel combinations to each time slot, be each time slot all distribute MAX (C1, C2, C3)=memory space of C1 size, like this, 8 time slots take the memory space of 8 * C1 size altogether.The advantage of this distribution method is that memory allocation is simple, and shortcoming is that the memory space that takies altogether of 8 time slots is very big, has increased the cost of GSM base station.
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, the distribution method of memory space in a kind of GSM base station baseband processing is provided, this method can make that the distribution of memory space is more flexible in the Base-Band Processing, thereby reduces the memory space of 8 Time Slot Occupancies widely.
The distribution method of memory space during GSM base station baseband of the present invention is handled, be used for memory space required when time-multiplexed 8 time slots carry out Base-Band Processing on radiofrequency signal of branch pairing, wherein, time slot 0,2,4,6 is configured to main Broadcast Control Channel combination, the combination of expansion Broadcast Control Channel and the combination of combination Broadcast Control Channel, time slot 1,3,5,7 is configured to Separate Dedicated Control Channel combination, traffic channel full rate combination, half rate combination one and half rate combination two, and it may further comprise the steps:
(1) for time slot 0,2,4,6, each time slot allocation size is the memory space of C1;
(2) for time slot 1,3,5,7, each time slot allocation size is the memory space of C2.
As another kind of implementation, the distribution method of memory space all distribute the memory space of identical size can for each time slot during GSM base station baseband of the present invention was handled, be MAX (C1+D1, C2+D2, C3+D3).
The present invention utilize the GSM base station baseband handle in the inconsistency of the required storage size of different channels combination, can significantly reduce 8 memory spaces that time slot is shared, thereby reduce requirement, reduced the cost of GSM base station dsp chip peripheral memory memory space.
Describe in further detail below in conjunction with the distribution method of accompanying drawing memory space in the GSM base station baseband processing of the present invention.
Fig. 1 is the memory allocation schematic diagram of first kind BCCH channel composite class;
Fig. 2 is the memory allocation schematic diagram of the second class SDCCH channel composite class;
Fig. 3 is the memory allocation schematic diagram of the 3rd class TCH channel composite class.
In the GSM base station baseband was handled, the size that different channels makes up needed memory space was different.And the size of the decoding input data buffering area of different channels combination also can be different because of the difference of channel combination.The present invention just is based on the inconsistency of the required storage size of this different channels combination, and the inconsistency of the size of the decoding input data buffering area of different channels combination, propose memory allocation method flexibly, thereby reduce by 8 memory spaces that time slot is shared.
(1) first method
According to the regulation of gsm protocol, channel makes up (i), (ii) and (iii) can only be configured on the time slot 0,2,4,6.That is to say that time slot 1,3,5,7 can only be configured to (iv), (v), (vi) and (vii) four kinds of channels combinations.For time slot 0,2,4,6, the required maximum memory space of each time slot be MAX (C1, C2, C3)=C1; For in time slot 1,3,5,7, the required maximum memory space of each time slot be MAX (C2, C3)=C2.Utilize this regulation of GSM, the present invention adopts following time slot memory allocation method:
(1) for time slot 0,2,4,6, each time slot allocation size is the memory space of C1;
(2) for time slot 1,3,5,7, each time slot allocation size is the memory space of C2.
Like this, 8 time slots take the memory space of 4 * (C1+C2) sizes altogether, have saved the memory space of 4 * (C1-C2) sizes than existing method.
(2) second method
The coding method of GSM channel has three steps usually: block code coding, convolution coding and interweave (interleaving), thereby its interpretation method also has the step of three correspondences: deinterleave, Viterbi (viterbi) decoding and block code decipher.In interleaving process, for the speech business of TCH, will once encode 456 bits that generate of encoder are distributed in 8 bursts (burst) and go; For the data service of TCH, will once encode 456 bits that generate of encoder are distributed in 22 bursts and go; And for SACCH channel (may be present in the combination of TCH channel combination and SDCCH channel), SDCCH channel, will once encode 456 bits of generation of encoder are distributed in 22 bursts and go.
Deinterleaving then is the inverse process of interleaving process: for the speech business of TCH, decoder waits until that whenever collecting 8 bursts just begins once to decipher; For the data service of TCH, decoder waits until that whenever collecting 22 bursts just begins once to decipher: and for SACCH channel, SDCCH channel, decoder waits until that whenever collecting 4 bursts just begins once to decipher.Therefore, coder will be provided with enough big buffering area to store the data of each channel before deinterleaving.The source of these data is demodulators, and form is demodulator soft-decision data form.Therefore, if a time slot configuration has become the 3rd class TCH channel composite class, base-band software will be prepared the buffering area of 22 * 114 (each burst is 114 data) word for the decoder input data of voice or data service, prepare the buffering area of 4 * 114 word sizes for following the SACCH channel, totally 26 * 114=2964 word, establishing this number is D3.If a time slot configuration has become the second class SDCCH channel composite class, base-band software will be prepared the buffering area of 4 * 114 (each burst is 114 data)=456 words for the decoder input data of SACCH or SDCCH channel, and establishing this number is D2.And for first kind BCCH channel composite class, its up channel all is Random Access Channel (RACH), do not need to deinterleave, promptly its up channel is not need buffer memory, so the required decoder input buffering data field size of BCCH channel composite class is D1=0.
Therefore, as another kind of implementation method of the present invention, when being each time slot allocation memory space, the channel memory space and the buffering area that deinterleaves can be combined consideration.For each class channel combination, its memory allocation is respectively as Fig. 1, Fig. 2 and shown in Figure 3.Base-band software of the present invention all distributes the memory space of identical size for each time slot, be MAX (C1+D1, C2+D2, C3+D3), thus 8 required memory spaces of time slot be altogether 8 * MAX (C1+D1, C2+D2, C3+D3).Each time slot all can satisfy the size requirements of the memory space of channel and the buffering area that deinterleaves like this.
To have memory allocation method and two kinds of methods works one that reach of the present invention below now relatively.Suppose C1=3, C2=2, C3=1, D1=0, D2=1, D3=2.
(1) existing memory allocation method
Channel memory space and decoding data input block size need 8 * (C1+D3) individual memory spaces altogether.Use the default substitution, need the memory space of 40 sizes altogether.
(2) first method of the present invention
Channel memory space and decoding data input block size need 4 * (C1+C2)+8 * D3 memory space altogether.Use the default substitution, need the memory space of 36 sizes altogether, slightly reduce than existing method.
(3) second method of the present invention
Channel memory space and decoding data input block size need 8 * MAX (C1+D1, C2+D2, C3+D3) individual memory space altogether.Use the default substitution, need the memory space of 24 sizes altogether, reduce widely than existing method.
Claims (9)
1. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing, be used for memory space required when time-multiplexed 8 time slots carry out Base-Band Processing on radiofrequency signal of branch pairing, wherein, time slot 0,2,4,6 is configured to main Broadcast Control Channel combination, the combination of expansion Broadcast Control Channel and the combination of combination Broadcast Control Channel, time slot 1,3,5,7 is configured to Separate Dedicated Control Channel combination, traffic channel full rate combination, half rate combination one and half rate combination two, it is characterized in that:
(1) for time slot 0,2,4,6, each time slot allocation size is the memory space of C1;
(2) for time slot 1,3,5,7, each time slot allocation size is the memory space of C2;
Wherein:
C1 is the size of the required memory space of Broadcast Control Channel (BCCH) composite class;
C2 is the size of the required memory space of Separate Dedicated Control Channel (SDCCH) composite class.
2. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 1, it is characterized in that: described Broadcast Control Channel (BCCH) composite class comprises main Broadcast Control Channel combination and the combination of expansion Broadcast Control Channel, and described Separate Dedicated Control Channel (SDCCH) composite class comprises combination of combination Broadcast Control Channel and Separate Dedicated Control Channel combination.
3. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 1 is characterized in that: from the size of memory space, C1＞C2.
4. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 1 is characterized in that: the required memory space of described Base-Band Processing is to be provided by Digital Signal Processing (DSP) chip.
5. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing, be used for memory space required when time-multiplexed 8 time slots carry out Base-Band Processing on radiofrequency signal of branch pairing, wherein, time slot 0,2,4,6 are configured to main Broadcast Control Channel combination, combination of expansion Broadcast Control Channel and the combination of combination Broadcast Control Channel, time slot 1,3,5,7 are configured to the Separate Dedicated Control Channel combination, the traffic channel full rate combination, half rate combination one and half rate combination two, it is characterized in that: described each time slot all distributes the memory space of identical size, be MAX (C1+D1, C2+D2, C3+D3);
Wherein:
C1 is the size of the required memory space of Broadcast Control Channel (BCCH) composite class;
C2 is the size of the required memory space of Separate Dedicated Control Channel (SDCCH) composite class;
C3 is the size of the required memory space of Traffic Channel (TCH) composite class;
D1 is the size of the required decoder input buffering data field of Broadcast Control Channel (BCCH) composite class;
D2 is the size of the required decoder input buffering data field of Separate Dedicated Control Channel (SDCCH) composite class;
D3 is the size of the required decoder input buffering data field of Traffic Channel (TCH) composite class.
6. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 5, it is characterized in that: described Broadcast Control Channel (BCCH) composite class comprises main Broadcast Control Channel combination and the combination of expansion Broadcast Control Channel, described Separate Dedicated Control Channel (SDCCH) composite class comprises combination of combination Broadcast Control Channel and Separate Dedicated Control Channel combination, and described Traffic Channel (TCH) composite class comprises traffic channel full rate combination, half rate combination one and half rate combination two.
7. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 5 is characterized in that: from the size of memory space, and C1＞C2＞C3.
8. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 5 is characterized in that: the big or small D1=0 of the decoder input buffering data field that described Broadcast Control Channel combination (BCCH) is required.
9. the distribution method of memory space in the base stations in mobile communication system Base-Band Processing according to claim 5 is characterized in that: the required memory space of described Base-Band Processing is to be provided by Digital Signal Processing (DSP) chip.
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| CN101340699B (en) * | 2007-07-03 | 2011-05-25 | 中兴通讯股份有限公司 | Base-band resource distributing method in wireless system |
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