CN101242250B - A method for identifying number of physical mixed retransfer channel - Google Patents
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Abstract
The invention discloses a method for determining the number of physical hybrid retransfer channels, comprising, firstly, determining the number of available resource blocks in current system bandwidth; further, determining the maximum value of the number of physical hybrid retransfer channels based on the number of available resource blocks in current system bandwidth; and after obtaining the valve of physical hybrid retransfer indicating signaling, rounding-up the arithmetic product of the maximum value of the number of physical hybrid retransfer channels and valve of physical hybrid retransfer indicating signaling, and setting the rounding-up result to be the available number of physical hybrid retransfer channels. Further, the invention discloses a method for the maximum value of the number of physical hybrid retransfer channels based on a duplex mode, and/or a reversal cycle, and/or an up/down proportion, and/or sub frame number. The invention can determine the available number of physical hybrid retransfer channels in a time division duplex system to determine the position of physical down control channel.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a method for determining the number of physical hybrid retransmission channels in a broadband wireless time division duplex system.
Background
An important feature of a Time Division Duplex (TDD) system is that subframes for uplink and downlink transmissions are configurable. The frame structure of the current LTE (Long Term Evolution ) tdd system is shown in fig. 1, where a 10ms radio frame is divided into two 5ms half-frames, each 5ms half-frame includes 8 general timeslots and 3 special timeslots: DwPTS, GP and UpPTS. The sum of the durations of these three special slots is 1ms, and every two consecutive general slots constitute a 1ms subframe. Wherein, the subframe #0, the subframe #5 and the DwPTS are fixed as a downlink timeslot.
In the above frame structure shown in fig. 1, the ratio of the lower and upper lines (which refers to the general uplink and downlink time slots, and the non-specific time slots) is related to the switching period. When the switching period is 5ms, the uplink and downlink proportion has three selectable items: 3: 1/2: 2/1: 3. When the switching period is 10ms, since the subframe #5 and DwPTS are fixed as downlink subframes, there are four options for the uplink and downlink ratio: 3: 6/2: 7/1: 8/5: 3. The choice of 10ms periods 3: 5 and 0: 10, among others, is yet to be discussed further.
The physical downlink control channel position is related to the number of physical hybrid retransmission channels, and the number of physical hybrid retransmission channels is related to the system bandwidth and the physical hybrid retransmission indication signaling, and in the time division duplex system, may also be related to the uplink and downlink proportion, and at present, the maximum number of physical hybrid retransmission channels is determined under various system bandwidths. Assuming that the number of available resource blocks is NRB under the current system bandwidth, the maximum number of physical hybrid retransmission channels is ceil (NRB/4).
The length of the physical hybrid retransmission indication signaling is 2 bits, and the signaling is sent on a physical broadcast channel, but the meaning of the signaling is not defined yet, and in a time division duplex system, the relationship between the number of the physical hybrid retransmission channels and the uplink and downlink proportion is not determined yet, so that the number of the physical hybrid retransmission channels cannot be determined yet, the position of the physical downlink control channel cannot be determined yet, and the system cannot be realized.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for determining the number of physical hybrid retransmission channels, which is used for determining the number of physical hybrid retransmission channels in a communication system so as to allow a user to determine the position of a downlink control channel according to the number of physical hybrid retransmission channels.
The invention provides a method for determining the number of physical hybrid retransmission channels in a mobile communication system, which comprises the following steps:
step one, determining the number of available resource blocks under the current system bandwidth;
step two, further determining the maximum value of the number of the physical hybrid retransmission channels according to the number of the available resource blocks under the current system bandwidth;
step three, obtaining the value of the physical hybrid retransmission indication signaling;
and step four, rounding up the product obtained by multiplying the maximum value of the number of the physical hybrid retransmission channels and the value of the physical hybrid retransmission indication signaling, and determining the result obtained by rounding up as the available number of the physical hybrid retransmission channels.
Furthermore, the invention also has the following characteristics: in step three, the physical hybrid retransmission indication signaling is 2-bit physical hybrid retransmission indication signaling, and the value of the physical hybrid retransmission indication signaling represents one of values in a value set composed of four values. The set of values includes: {1, 1/2, 1/4, 1/8}, {1, 1/2, 1/4, 1/6}, {1, 1/2, 1/6, 1/12}, {1, 1/2, 1/6, 1/8}, or {1, 2/3, 1/2, 1/4 }.
Furthermore, the invention also has the following characteristics: in the second step, a calculation factor h is further determined according to a duplex mode, and/or a switching period, and/or an uplink-downlink ratio, and/or a subframe number, and then the maximum value of the number of the physical hybrid retransmission channels is an integer value obtained by rounding up a quotient obtained by multiplying the number of available resource blocks under the current system bandwidth by the calculation factor h and then dividing by four.
Furthermore, the invention also has the following characteristics: in the second step, a calculation factor h is further determined according to a duplex mode, and/or a switching period, and/or an uplink-downlink ratio, and/or a subframe number, and then the maximum value of the number of the physical hybrid retransmission channels is a product obtained by rounding up one fourth of the number of available resource blocks under the current system bandwidth and multiplying the rounded value by the calculation factor h.
Furthermore, the invention also has the following characteristics:
if the mobile communication system is a frequency division duplex system, if the calculation factor h is 1, the maximum value of the number of physical hybrid retransmission channels is:
multiplying the number of available resource blocks under the current system bandwidth by the calculation factor h which is 1, dividing the result by a quotient of four, and rounding up to obtain an integer value;
or rounding up one fourth of the number of available resource blocks under the current system bandwidth, and multiplying the rounded number by the calculation factor h which is 1.
Furthermore, the invention also has the following characteristics:
if the mobile communication system is a time division duplex system, the calculation factor h is 0, 1, or 2.
Furthermore, the invention also has the following characteristics:
when the mobile communication system is a time division duplex system and the switching period is 5 msec,
if the uplink-downlink ratio is 3: 1, h is 2 in the subframe #0 and the subframe # 5; in subframe #1 and subframe #6, h is 1; in other subframes, h is 0; or
If the uplink-downlink ratio is 2: 2, h is 1 in subframe #1, subframe #4, subframe #6 and subframe # 9; in other subframes, h is 0; or,
if the uplink-downlink ratio is 1: 3, h is 1 in subframe #1 and subframe # 6; in other subframes, h is 0.
Furthermore, the invention also has the following characteristics:
when the mobile communication system is a time division duplex system and the switching period is 10 msec,
if the uplink-downlink ratio is 5: 3, in the subframe #9, h is 2; in subframe #1 and subframe #6, h is 1; other subframes, h ═ 0; or,
if the uplink-downlink ratio is 3: 6, h is 1 in subframe #6, subframe #7 and subframe # 8; in other subframes, h is 0; or,
if the uplink-downlink ratio is 2: 7, h is 1 in subframe #6 and subframe # 7; in other subframes, h is 0; or,
if the uplink-downlink ratio is 1: 8, in subframe #6, h is 1; in other subframes, h is 0; or,
if the ratio of the uplink to the downlink is 0: 10, h is 0.
Furthermore, the invention also has the following characteristics:
when the mobile communication system is a time division duplex system and the switching period is 5 milliseconds, if the uplink-downlink ratio is 3: 1, h is 0, 1 or 2; or,
when the mobile communication system is a time division duplex system and the switching period is 10 milliseconds, if the uplink-downlink ratio is 5: 3, h is 0, 1 or 2; or,
when the mobile communication system is a time division duplex system and the switching period is 10 milliseconds, if the uplink and downlink proportion is 0: 10, h is 0; or,
in other cases, h is 0, or 1.
The invention also provides a method for determining the maximum value of the number of physical hybrid retransmission channels, which comprises the following steps:
step one, determining the number of available resource blocks under the current system bandwidth;
secondly, determining a calculation factor h according to a duplex mode, and/or a switching period, and/or an uplink and downlink proportion, and/or a subframe number;
step three, the maximum value of the number of the physical hybrid retransmission channels is determined by the product obtained by multiplying a quarter of the number of the available resource blocks under the current system bandwidth by the calculation factor h after the upward rounding, or the maximum value of the number of the physical hybrid retransmission channels is determined by the integral value obtained by dividing the product obtained by multiplying the number of the available resource blocks under the current system bandwidth by the calculation factor h by four after the upward rounding.
Further, if the system is a frequency division duplex system, determining that h is 1;
if the system is a time division duplex system, h is determined to be 0, or 1, or 2.
The invention provides a method for defining the number of physical hybrid retransmission channels, which is convenient for a user to determine the position of a physical downlink control channel according to the available number of the physical hybrid retransmission channels and is beneficial to the realization of a system.
Drawings
FIG. 1 is a schematic diagram of a frame structure of a time division duplex system;
fig. 2 is a flowchart for determining the number of physical hybrid retransmission channels in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
The invention provides a method for determining the number of physical hybrid retransmission channels in a communication system, in particular a time division duplex communication system, so that a user can determine the position of a physical downlink control channel according to the number of the physical hybrid retransmission channels. The core of the invention is that the maximum number n of physical hybrid retransmission channels and the current physical hybrid retransmission indication signaling k are utilized to determine the number of the physical hybrid retransmission channels, and a calculation factor h is further introduced for different duplex systems, different switching cycles, time slot ratios and subframes to calculate the maximum number n of the physical hybrid retransmission channels.
As shown in fig. 2, the method for determining the number of physical hybrid retransmission channels of the present invention comprises the following steps:
step 201, determining the number NRB of available resource blocks under the current system bandwidth;
step 202, further determining the maximum value n of the number of physical hybrid retransmission channels according to the number NRB of available resource blocks under the current system bandwidth;
in this step, a calculation factor h is determined according to a duplex mode, and/or a switching period, and/or an uplink-downlink ratio, and the maximum value of the number of the physical hybrid retransmission channels is an integer value obtained by rounding up a quotient obtained by multiplying the number of available resource blocks in the current system bandwidth by the calculation factor h and then dividing by four, or a product obtained by rounding up one quarter of the number of available resource blocks in the current system bandwidth and then multiplying by the calculation factor h. Namely:
the maximum value n of the number of physical hybrid retransmission channels is ceil (NRB × h/4) or n is ceil (NRB/4) × h;
NRB is the number of available resource blocks under the current system bandwidth, h is the calculation factor, and ceil () represents rounding-up operation.
Step 203, obtaining a value k of a physical hybrid retransmission indication signaling;
the physical hybrid retransmission indication signaling is 2-bit physical hybrid retransmission indication signaling, and the value of the physical hybrid retransmission indication signaling represents one of values in a value set consisting of four values. The set of values includes: {1, 1/2, 1/4, 1/8}, {1, 1/2, 1/4, 1/6}, {1, 1/2, 1/6, 1/12}, {1, 1/2, 1/6, 1/8}, or {1, 2/3, 1/2, 1/4 }. Specifically, k represents a coefficient represented by the current physical hybrid retransmission indication signaling, and the 2-bit physical hybrid retransmission indication signaling can have four states (00, 01, 10, 11), then the meaning of the 2-bit physical hybrid retransmission indication signaling is as follows:
k is 1, 1/2, 1/4, 1/8; or k is 1, 1/2, 1/4, 1/6; or k is 1, 1/2, 1/6, 1/12;
or k is 1, 1/2, 1/6, 1/8; or k is 1, 2/3, 1/2, 1/4;
the four values of k correspond to the four states (00, 01, 10, 11) one to one.
And 204, rounding up the product obtained by multiplying the maximum value of the number of the physical hybrid retransmission channels and the value of the physical hybrid retransmission indication signaling, and determining the result obtained by rounding up as the available number of the physical hybrid retransmission channels in the current system. Namely: the available number of the physical hybrid retransmission channels in the current system is ceil (n × k), wherein n represents the maximum number of the physical hybrid retransmission channels under the current system bandwidth, k represents a coefficient represented by the current physical hybrid retransmission indication signaling, and the ceil () represents an rounding-up operation.
In step 202, when the maximum value n of the number of physical hybrid retransmission channels is further determined according to the number NRB of available resource blocks in the current system bandwidth, the following specific cases may be further specified:
(1) if the mobile communication system is a frequency division duplex system, if the calculation factor h is 1, the maximum value of the number of the physical hybrid retransmission channels is an integer value obtained by rounding up a quotient obtained by multiplying the number of available resource blocks in the current system bandwidth by the calculation factor h, which is 1, and dividing the result by four.
(2) If the mobile communication system is a time division duplex system, when determining the calculation factor h, the following configuration schemes can be adopted:
configuration 1:
● switching period is 5ms
■ when the ratio of the upstream to the downstream is 3: 1,
in subframe #0 and subframe #5, h is 2;
in subframe #1 and subframe #6, h is 1;
other subframes, h ═ 0;
■ when the ratio of the upstream to the downstream is 2: 2,
in subframe #1, subframe #4, subframe #6, and subframe #9, h is 1;
other subframes, h ═ 0;
■ when the ratio of the upstream to the downstream is 1: 3,
in subframe #1 and subframe #6, h is 1;
other subframes, h ═ 0;
● when the switching period is 10ms,
■ when the ratio of the upstream to the downstream is 5: 3,
in subframe #9, h is 2;
in subframe #1 and subframe #6, h is 1;
other subframes, h ═ 0;
■ when the ratio of upstream to downstream is 3: 6,
in subframe #6, subframe #7, and subframe #8, h is 1;
other subframes, h ═ 0;
■ when the ratio of up-down going is 2: 7,
in subframe #6 and subframe #7, h is 1;
other subframes, h ═ 0;
■ when the ratio of the upstream to the downstream is 1: 8,
in subframe #6, h is 1;
other subframes, h ═ 0;
■ when the ratio of the upstream to the downstream is 0: 10,
h＝0；
configuration 2:
● when the switching period is 5ms uplink and downlink proportion is 3: 1 and the switching period is 10ms uplink and downlink proportion is 5: 3, h is 0, 1, 2;
● switching period is 10ms, when the ratio of up and down going is 0: 10, h is 0;
● in other cases, h is 0, 1;
in order to understand the invention deeply, the invention further provides some application examples of the technical scheme of the invention.
Example 1
Assuming that the number of available resource blocks is NRB in the current system bandwidth, the number of the current physical hybrid retransmission channels is ceil (n × k).
The meaning of the 2-bit physical hybrid retransmission indication signaling is defined as follows:
00 denotes k ═ 1; 01 denotes k 1/2;
10 represents k-1/4; 11 represents k-1/8;
(11) in a frequency division duplex system, h is 1;
under the current system bandwidth, the maximum value n of the number of physical hybrid retransmission channels is defined as follows:
n＝ceil(NRB/4)×h＝ceil(NRB/4)；
the available number of physical hybrid retransmission channels in the current system is ceil (ceil (NRB/4) × k).
(12) In a time division duplex system, the time division duplex system,
●, if the uplink and downlink ratio of 5ms is 3: 1 and the uplink and downlink ratio of 10ms is 5: 3, the number of the current physical hybrid retransmission channels is:
ceil(ceil(NRB/4)×h×k)，h＝0，1，2；
●, if the switching period is 10ms and the ratio of uplink to downlink is 0: 10, h is 0; the number of the current physical hybrid retransmission channels is 0;
● otherwise, the number of the current physical hybrid retransmission channels is:
ceil(ceil(NRB/4)×h×k)，h＝0，1；
example 2
Assuming that the number of available resource blocks is NRB in the current system bandwidth, the number of the current physical hybrid retransmission channels is ceil (n × k).
The meaning of the 2-bit physical hybrid retransmission indication signaling is defined as follows:
00 denotes k ═ 1; 01 denotes k 1/2;
10 represents k-1/4; 11 represents k-1/6;
(21) in a frequency division duplex system, h is 1;
under the current system bandwidth, the maximum value n of the number of physical hybrid retransmission channels is defined as follows:
n＝ceil(NRB×h/4)＝ceil(NRB/4)；
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k).
(22) In a time division duplex system
● switching period is 5ms
■ when the ratio of the upstream to the downstream is 3: 1,
in subframe #0 and subframe #5, h is 2;
then, the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/2) × k);
in subframe #1 and subframe #6, h is 1;
then, the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
in other subframes, h is 0;
then, the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of the upstream to the downstream is 2: 2,
in subframe #1, subframe #4, subframe #6, and subframe #9, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of the upstream to the downstream is 1: 3,
in subframe #1 and subframe #6, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
● when the switching period is 10ms,
■ when the ratio of the upstream to the downstream is 5: 3,
in subframe #9, h is 2;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/2) × k);
in subframe #1 and subframe #6, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of upstream to downstream is 3: 6,
in subframe #6, subframe #7, and subframe #8, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of up-down going is 2: 7,
in subframe #6 and subframe #7, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of the upstream to the downstream is 1: 8,
in subframe #6, h is 1;
the number of the current physical hybrid retransmission channels is ceil (ceil (NRB/4) × k);
other subframes, h ═ 0;
the number of the current physical hybrid retransmission channels is 0;
■ when the ratio of the upstream to the downstream is 0: 10,
the number of the current physical hybrid retransmission channels is 0;
the present invention has been described in terms of the preferred embodiment, but it is not limited thereto, and various modifications and changes can be made by those skilled in the art. Therefore, any modification, equivalent replacement, improvement, and updating made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for determining the number of physical hybrid retransmission channels in a mobile communication system, comprising the steps of:
step one, determining the number of available resource blocks under the current system bandwidth;
step two, further determining the maximum value of the number of the physical hybrid retransmission channels according to the number of the available resource blocks under the current system bandwidth and a calculation factor h;
step three, obtaining the value of the physical hybrid retransmission indication signaling;
step four, rounding up the product obtained by multiplying the maximum value of the number of the physical hybrid retransmission channels and the value of the physical hybrid retransmission indication signaling, and determining the result obtained by rounding up as the available number of the physical hybrid retransmission channels;
the calculation factor h is determined according to a duplex mode, and/or a switching period, and/or an uplink and downlink proportion, and/or a subframe number.
2. The method of claim 1, wherein:
in step three, the physical hybrid retransmission indication signaling is 2-bit physical hybrid retransmission indication signaling, and the value of the physical hybrid retransmission indication signaling represents one of values in a value set composed of four values.
3. The method of claim 2, wherein:
the set of values includes: {1, 1/2, 1/4, 1/8}, {1, 1/2, 1/4, 1/6}, {1, 1/2, 1/6, 1/12}, {1, 1/2, 1/6, 1/8}, or {1, 2/3, 1/2, 1/4 }.
4. The method of claim 1, wherein:
in the second step, a calculation factor h is further determined according to a duplex mode, and/or a switching period, and/or an uplink-downlink ratio, and/or a subframe number, and then the maximum value of the number of the physical hybrid retransmission channels is an integer value obtained by rounding up a quotient obtained by multiplying the number of available resource blocks under the current system bandwidth by the calculation factor h and then dividing by four.
5. The method of claim 1, wherein:
in the second step, a calculation factor h is further determined according to a duplex mode, and/or a switching period, and/or an uplink-downlink ratio, and/or a subframe number, and then the maximum value of the number of the physical hybrid retransmission channels is a product obtained by rounding up one fourth of the number of available resource blocks under the current system bandwidth and multiplying the rounded value by the calculation factor h.
6. The method of claim 4 or 5, wherein:
if the mobile communication system is a frequency division duplex system, if the calculation factor h is 1, the maximum value of the number of physical hybrid retransmission channels is:
multiplying the number of available resource blocks under the current system bandwidth by the calculation factor h which is 1, dividing the result by a quotient of four, and rounding up to obtain an integer value;
or rounding up one fourth of the number of available resource blocks under the current system bandwidth, and multiplying the rounded number by the calculation factor h which is 1.
7. The method of claim 1, wherein:
if the mobile communication system is a time division duplex system, the calculation factor h is 0, 1, or 2.
8. The method of claim 7, wherein:
when the mobile communication system is a time division duplex system and the switching period is 5 msec,
if the uplink-downlink ratio is 3: 1, h is 2 in the subframe #0 and the subframe # 5; in subframe #1 and subframe #6, h is 1; in other subframes, h is 0; or
If the uplink-downlink ratio is 2: 2, h is 1 in subframe #1, subframe #4, subframe #6 and subframe # 9; in other subframes, h is 0; or,
if the uplink-downlink ratio is 1: 3, h is 1 in subframe #1 and subframe # 6; in other subframes, h is 0.
9. The method of claim 7, wherein:
when the mobile communication system is a time division duplex system and the switching period is 10 msec,
if the uplink-downlink ratio is 5: 3, in the subframe #9, h is 2; in subframe #1 and subframe #6, h is 1; other subframes, h ═ 0; or,
if the uplink-downlink ratio is 3: 6, h is 1 in subframe #6, subframe #7 and subframe # 8; in other subframes, h is 0; or,
if the uplink-downlink ratio is 2: 7, h is 1 in subframe #6 and subframe # 7; in other subframes, h is 0; or,
if the uplink-downlink ratio is 1: 8, in subframe #6, h is 1; in other subframes, h is 0; or,
if the ratio of the uplink to the downlink is 0: 10, h is 0.
10. The method of claim 7, wherein:
when the mobile communication system is a time division duplex system and the switching period is 5 milliseconds, if the uplink-downlink ratio is 3: 1, h is 0, 1 or 2; or,
when the mobile communication system is a time division duplex system and the switching period is 10 milliseconds, if the uplink-downlink ratio is 5: 3, h is 0, 1 or 2; or,
when the mobile communication system is a time division duplex system and the switching period is 10 milliseconds, if the uplink and downlink proportion is 0: 10, h is 0; or,
in other cases, h is 0, or 1.
11. A method for determining a maximum number of physical hybrid retransmission channels, comprising:
step one, determining the number of available resource blocks under the current system bandwidth;
secondly, determining a calculation factor h according to a duplex mode, and/or a switching period, and/or an uplink and downlink proportion, and/or a subframe number;
step three, the maximum value of the number of the physical hybrid retransmission channels is determined by the product obtained by multiplying a quarter of the number of the available resource blocks under the current system bandwidth by the calculation factor h after the upward rounding, or the maximum value of the number of the physical hybrid retransmission channels is determined by the integral value obtained by dividing the product obtained by multiplying the number of the available resource blocks under the current system bandwidth by the calculation factor h by four after the upward rounding.
12. The method of claim 11, wherein:
if the system is a frequency division duplex system, determining h is 1;
if the system is a time division duplex system, h is determined to be 0, or 1, or 2.
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| US6996127B2 (en) * | 1998-09-10 | 2006-02-07 | Qualcomm Incorporated | Method and apparatus for distributed optimal reverse link scheduling of resources, such as rate and power, in a wireless communication system |
| CN101056158A (en) * | 2007-03-23 | 2007-10-17 | 武汉大学 | A channel-status based self-adapted data classification protection method |
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