WO2013170699A1

WO2013170699A1 - Downlink information transmission method, base station, and user equipment

Info

Publication number: WO2013170699A1
Application number: PCT/CN2013/074861
Authority: WO
Inventors: 李新彩; 戴博; 张文峰; 石靖; 夏树强; 方惠英
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-05-16
Filing date: 2013-04-27
Publication date: 2013-11-21
Also published as: CN103428859A

Abstract

The present invention provides a downlink information transmission method, comprising: a base station determining whether the maximum reception bandwidth supported by a user equipment (UE) is smaller than a current downlink system bandwidth; if yes, the base station transmitting downlink information of the UE on N PRBs, and otherwise, the base station transmitting the downlink information of the UE on the current downlink system bandwidth, 1≤N≤n+l, n being the number of PRBs corresponding to the maximum reception bandwidth supported by the UE. According to the method of the present invention, in scenarios where the system bandwidth and the maximum reception bandwidth of the UE are different, a unified resource mapping rule is defined between the base station and the UE, so as to ensure effective communication between the base station and the MTCUE, and enable different UEs to share a same channel, thereby increasing the resource utilization rate.

Description

Downlink information transmission method, base station and user equipment

Technical field

The present invention relates to the field of wireless communications, and in particular to a method for downlink information transmission (including transmission and reception), a base station, and a user equipment. Background technique

Machine Type Communication User Equipment (MTC UE), also known as M2M (Machine To Machine) user communication equipment, is the main application form of the Internet of Things at this stage. Low power consumption and low cost are important guarantees for large-scale applications. At present, M2M technology has been supported by internationally renowned manufacturers such as NEC, HP, CA, Intel, IBM, AT&T, and mobile operators in various countries. The M2M devices currently deployed on the market are mainly based on the GSM (Global System of Mobile communication) system. In recent years, due to the high spectrum efficiency of LTE (Long Term Evolution), more and more mobile operators have chosen LTE as the evolution direction of future broadband wireless communication systems. M2M multi-type data services based on LTE will also be more attractive. Only the cost of the LTE-M2M device can be lower than that of the MTC terminal of the GSM system, and the M2M service can be truly transferred from the GSM to the LTE system.

The cost of affecting MTC UEs is mainly in baseband processing and radio frequency. Reducing the downlink receiving bandwidth of the UE is a very effective way to reduce the cost of the MTC UE. That is, the maximum supported downlink bandwidth of the MTC UE is smaller than that of the conventional legacy LTE terminal (Ordinary Legacy R8/9/10 UE, OL UE for short), which requires a maximum reception bandwidth of 20 MHz. The receiving bandwidth of the MTC UE can be set to a small bandwidth supported by an LTE system such as 1.4 MHz or 3 MHz.

In the LTE system, a physical resource block (PRB) is used as a resource allocation unit. A time slot on a PRB corresponds to a time slot, and the width in the frequency domain is 180 kHz. When a regular CP is selected, the subcarrier spacing is 15 kHz, each PRB contains 12 subcarriers, and one slot contains 7 OFDMA symbols. The number of PRBs corresponding to the bandwidth and transmission bandwidth of each channel system is shown in Table 1. Channel system bandwidth BW [MHz] 1.4 3 5 10 20

Transmission Bandwidth Configuration PRB Number 6 15 25 50 100 The specific channel system bandwidth and transmission bandwidth configuration is shown in Figure 1. For example, in the case of a system bandwidth of 5 MHz, the transmission bandwidth occupies 25 PRBs in the central frequency domain, and 0.5 MHz remains on both sides of the channel as the system guard interval.

In the LTE downlink, the direct current (DC) subcarrier is located at the center frequency position of the system bandwidth. If the system bandwidth contains an even number of PRBs, the DC subcarriers are located exactly between the two PRBs. If the system bandwidth contains an odd number of PRBs, the DC subcarriers pass through the center of the intermediate PRB.

In particular, when the maximum supported bandwidth of the MTC UE is an even number of PRBs, and the system bandwidth includes an odd number of PRBs, for example, 3 MHz or 5 MHz, the DC subcarrier of the MTC UE and the DC sub of the OL UE appear in the frequency domain. The carriers cannot be completely coincident. As shown in Figure 2, there are offsets of 6 subcarriers. Since the division of the PRB is determined according to the position of the DC subcarrier, if the DC subcarrier of the MTC UE and the DC subcarrier of the OL UE cannot completely overlap, the PRB division of the MTC UE and the PRB division of the OL UE cannot be completely identical, resulting in the base station. The downlink information sent to the MTC UE cannot be correctly received by the MTC UE, and the base station and the MTC UE cannot communicate effectively. Currently, there is no effective solution to the problem.

Summary of the invention

The technical problem to be solved by the present invention is to provide a downlink information transmission (including transmission and reception) method, a base station and a user equipment to solve the problem of effective communication between the base station and the user equipment.

To solve the above technical problem, the present invention provides a downlink information transmission method, including: determining, by a base station, whether a maximum reception bandwidth supported by a user equipment (UE) is smaller than a current downlink system bandwidth; if the determination is yes, the base station is on the N PRBs. Transmitting the downlink information of the UE, otherwise, the base station transmits the downlink information of the UE on the current downlink system bandwidth, where l^N^n+l, n is the PRB corresponding to the maximum receiving bandwidth supported by the UE. Number.

The N PRBs are N PRBs in the frequency domain of the downlink system bandwidth, or N PRBs specified by the signaling. The N PRBs corresponding to the process of the user equipment accessing the system are different from the N PRBs corresponding to the non-access system process of the user equipment, or the N PRBs corresponding to the downlink control information and the N PRBs corresponding to the downlink data carried by the physical downlink shared channel. different.

The PRB division method corresponding to the N PRBs is determined according to the maximum reception bandwidth supported by the UE or the current downlink system bandwidth.

The PRB division method corresponding to the N PRBs is determined according to the parity of the PRB number corresponding to the maximum reception bandwidth supported by the UE, and/or according to the parity of the PRB number corresponding to the current downlink system bandwidth.

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the parity of the PRB number corresponding to the maximum received bandwidth supported by the UE are different according to the current downlink. When the parity of the number of PRBs corresponding to the system bandwidth is PRB-divided, the N is n, n+1 or nl.

When the UE supports the two types of maximum receiving bandwidths, the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE is an odd number n1 and an even number n2, respectively, and the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth. Time,

When the number of PRBs corresponding to the current downlink system bandwidth is an even number, the N is n2;

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. In order to solve the above technical problem, the present invention further provides a downlink information transmission method, including: a user equipment (UE) determines whether a maximum reception bandwidth supported by the UE is smaller than a current downlink system bandwidth; if the determination is yes, the UE is in N The downlink information is received on the PRB. Otherwise, the UE receives the downlink information on the current downlink system bandwidth, where l^N^n+l, n is the number of PRBs corresponding to the maximum received bandwidth supported by the UE.

The N PRBs are N PRBs in the frequency domain of the downlink system bandwidth, or N PRBs specified by the signaling.

The N PRBs corresponding to the process of the user equipment accessing the system are different from the N PRBs corresponding to the non-access system process of the user equipment, or the N PRBs corresponding to the downlink control information and the N PRBs corresponding to the downlink data carried by the physical downlink shared channel. different. The PRB division method corresponding to the N PRBs is determined according to the maximum reception bandwidth supported by the UE or the current downlink system bandwidth.

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the parity of the PRB number corresponding to the maximum received bandwidth supported by the UE are different according to the current downlink. When the parity of the number of PRBs corresponding to the system bandwidth is PRB-divided, the N is n+1 or n-1.

When the UE supports two types of maximum receiving bandwidths, the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE is an odd number n1 and an even number n2, respectively, and the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth. Time,

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. To solve the above technical problem, the present invention also provides a base station, including:

a bandwidth judging module, configured to determine whether a maximum receiving bandwidth supported by the user equipment (UE) is smaller than a current downlink system bandwidth;

a downlink information sending module, configured to send downlink information to the UE, and if it is determined that the maximum receiving bandwidth supported by the UE is smaller than the current downlink system bandwidth, transmitting downlink information of the UE on the N PRBs, otherwise, currently The downlink information of the UE is transmitted on the downlink system bandwidth, where l≤N≤n+1, n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE.

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth is different from the parity of the PRB number corresponding to the maximum received bandwidth supported by the UE, and according to the current Parity of the number of PRBs corresponding to the downlink system bandwidth When PRB is divided, the N is n, n+1 or nl.

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. In order to solve the above technical problem, the present invention further provides a user equipment, where the user equipment includes: a bandwidth determining module, configured to determine whether a maximum receiving bandwidth supported by the user equipment is smaller than a current downlink system bandwidth;

The downlink information receiving module is configured to receive downlink information, and if it is determined that the maximum receiving bandwidth supported by the user equipment is smaller than the current downlink system bandwidth, receive downlink information on the N PRBs, otherwise, receive downlink information on the current downlink system bandwidth. Wherein, l ^N^n+l , n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE.

The N PRBs corresponding to the process of the user equipment accessing the system are different from the N PRBs corresponding to the non-access system process of the user equipment, or the N PRBs corresponding to the downlink control information and the N PRBs corresponding to the downlink data carried by the physical downlink shared channel. different.

The PRB division method corresponding to the N PRBs is determined according to the parity of the PRB number corresponding to the current downlink system bandwidth, and/or the parity of the PRB number corresponding to the maximum reception bandwidth supported by the UE.

When the UE supports two types of maximum receiving bandwidths, the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE is an odd number n1 and an even number n2, respectively, and the maximum downlink system supported by the UE When the system bandwidth is less than the current downlink system bandwidth,

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. The method of the present invention defines a unified resource mapping rule between the base station and the user equipment in a scenario where the system bandwidth and the maximum receiving bandwidth of the user equipment are different, so that effective communication between the base station and the MTC UE is ensured, so that different UEs can share the same channel. Increased resource utilization. BRIEF abstract

FIG. 1 is a schematic diagram of system bandwidth and transmission bandwidth configuration in LTE;

2 is a schematic diagram of a DC subcarrier frequency offset;

3 is a schematic diagram of an embodiment of a downlink information transmission method according to the present invention; FIG. 4 is a schematic structural diagram of a module of a base station according to the present invention;

5 is a schematic diagram of an embodiment of a downlink information transmission method described in the perspective of a user equipment according to the present invention;

6 is a schematic structural diagram of a module of a user equipment according to the present invention;

7 is a schematic diagram of downlink information resources in Application Example 1;

8 is a schematic diagram of downlink information resources in Application Example 2;

9 is a schematic diagram of downlink information resources in Application Example 3;

FIG. 10 is a schematic diagram of downlink information resources in Application Example 4. Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

The downlink information transmission (ie, transmission) method of the present invention is introduced from the perspective of a base station. As shown in FIG. 3, the method includes: Step 301: The base station determines whether the maximum receiving bandwidth supported by the user equipment (UE) is smaller than the current downlink system bandwidth; if yes, step 302 is performed, otherwise step 303 is performed;

Step 302: The base station transmits the downlink information of the UE on the N PRBs, where 1 ≤ N ≤ n + l, where n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE;

When the maximum received bandwidth supported by the UE is smaller than the current downlink system bandwidth, the N PRBs may be N PRBs in the frequency domain of the downlink system bandwidth, or N PRBs specified by the signaling. In a specific implementation, the number N of the PRBs specified by the signaling may be: l ^N^n+l , for example, the receiving bandwidth of the low bandwidth limited UE may be 1 or 2 or 3 or 4 or 6 PRB.

When the method specified by the signaling is used, the N PRBs of each subframe may be represented by different positions and numbers, or different positions, or different numbers.

When the number of the PRs is not specified by the signaling, the base station transmits the downlink information of the UE on the N PRBs, where N is n, n+1 or n-1, where n is supported by the UE. The number of PRBs corresponding to the maximum receiving bandwidth; the frequency domain bandwidth occupied by the downlink information is less than or equal to N.

Specifically, the PRB division method corresponding to the N PRBs is determined according to one of the following manners: Method 1:

The PRB is divided according to the parity of the number of PRBs corresponding to the maximum reception bandwidth supported by the UE.

That is, when the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an odd number, the PRB is divided according to the number of PRBs. When the number of PRBs corresponding to the maximum received bandwidth supported by the UE is even, the number of PRBs is even. PRB division.

More specifically:

When the number of PRBs corresponding to the system bandwidth is an odd number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an even number, the PRB is divided according to the number of PRBs;

When the number of PRBs corresponding to the system bandwidth is an even number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an odd number, the PRB is divided according to the number of PRBs; When the number of PRBs corresponding to the system bandwidth is an even number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an even number, the PRB is divided according to the number of PRBs;

When the number of PRBs corresponding to the system bandwidth is an odd number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an odd number, the PRB is divided according to the number of PRBs.

If the number of PRBs corresponding to the system bandwidth is different from the parity of the number of PRBs corresponding to the maximum received bandwidth supported by the UE, the mode 1 is used.

If the number of PRBs corresponding to the downlink system bandwidth is m, and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is n, and m is an odd number, and n is an even number, then the UE is centered on the DC subcarriers, and is symmetrically acquired on the upper and lower sides. n/2 or (nl)/2 or (n+1)/2 PRBs are used as downlink resources for the UE to transmit downlink information. The base station obtains n/2 or (n-1)/2 or (n+1)/2 PRBs symmetrically as the downlink resources of the UE to transmit downlink information, centering on the DC subcarriers.

Way two

The PRB is divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth; that is, when the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the PRB is divided according to the number of PRBs; the number of PRBs corresponding to the current downlink system bandwidth When the even number is used, the PRB is divided according to the number of PRBs.

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the parity of the PRB number corresponding to the maximum received bandwidth supported by the UE are different, and corresponding to the current downlink system bandwidth. When the parity of the PRB is divided into PRBs, the N is n, n+1 or n-1, where n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE;

An example of ^ below:

When the downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth is different from the parity of the maximum number of PRBs supported by the UE, and corresponding to the current downlink system bandwidth. When the parity of the number of PRBs is PRB-divided, When the number of PRBs corresponding to the maximum received bandwidth supported by the UE is n, the UE takes the DC subcarrier as the center and acquires PRBs of different sizes in the upper and lower sides of the frequency domain. For example, the upper side acquires (nl)/2, and the lower side acquires (n+l)/2 PRBs, or the upper side acquires (n+l)/2, and the lower side acquires (nl)/2 PRBs.

The position of the DC subcarrier is the position of the center frequency point.

It can be understood that the PRB division is performed according to the number of PRBs, that is, the DC subcarrier is located in the middle.

The center of the PRB; PRB is divided according to the number of PRBs, that is, the DC subcarrier is located between the two PRBs.

When the UE supports the two types of maximum receiving bandwidths, the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE is an odd number n1 and an even number n2, respectively, and the maximum supported downlink system bandwidth of the UE is smaller than the current downlink system bandwidth. Time,

When the number of PRBs corresponding to the current downlink system bandwidth is an even number, the N is n2; when the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is n1. The N PRBs corresponding to the process of the user equipment accessing the system are different from the N PRBs corresponding to the non-access system process of the user equipment, or the N PRBs corresponding to the downlink control information and the N PRBs corresponding to the downlink data carried by the physical downlink shared channel. different. The specific difference can be expressed as different positions and numbers, or different positions, or different numbers.

For example, when the second mode is used, the downlink resource cost corresponding to the downlink data of the UE is n-1 PRBs, and the DCI (downlink control information) cost is calculated according to the bandwidth of the n PRB systems, and the downlink resource cost corresponding to the downlink data of the UE. It is n+1 PRBs, and the DCI overhead is calculated according to the bandwidth of n+1 PRB systems.

Step 303: The base station transmits downlink information of the UE on a current downlink system bandwidth. The method proposed by the embodiment of the present invention is applicable to an LTE UE, and is particularly applicable to an MTC UE. By using the method proposed by the present invention, the equipment cost based on the LTE terminal can be greatly reduced without affecting the performance of the LTE system. In addition, it can solve the problem that the bandwidth-constrained MTC terminal realizes bandwidth acquisition, successfully receives downlink data, promotes the evolution of the MTC service from the GSM system to the LTE system, and can improve the original spectrum efficiency.

Corresponding to the foregoing method, the present invention further provides a base station. As shown in FIG. 4, the base station includes: a bandwidth judging module, configured to determine whether a maximum receiving bandwidth supported by the user equipment (UE) is smaller than a current downlink system bandwidth;

As described above, the N PRBs are N PRBs in the frequency domain of the downlink system bandwidth, or N PRBs specified by the signaling.

Specifically, the method for dividing the PRB corresponding to the N PRBs is determined according to one of the following manners: Mode 1: performing parity according to the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE.

PRB division.

More specifically,

When the number of PRBs corresponding to the system bandwidth is an even number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an odd number, the PRB is divided according to the number of PRBs.

When the number of PRBs corresponding to the system bandwidth is even and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is even, the PRB is divided according to the number of PRBs;

Method 2:

Performing PRB partitioning according to the parity of the number of PRBs corresponding to the current downlink system bandwidth; When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth is different from the parity of the maximum number of PRBs supported by the UE, and according to the current downlink system. When the parity of the number of PRBs corresponding to the bandwidth is PRB-divided, the N is n, n+1, or nl.

When the number of PRBs corresponding to the current downlink system bandwidth is an even number, the N is n2; when the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is n1. The following describes the downlink information receiving method of the present invention from the perspective of the user equipment. As shown in FIG. 5, the method includes:

Step 501: The user equipment (UE) determines whether the maximum received bandwidth is less than the current downlink system bandwidth; if yes, go to step 502, otherwise go to step 503;

Step 502: The UE receives downlink information on the N PRBs, where l^N^n+l, n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE;

specifically: When the number of PRBs corresponding to the system bandwidth is an odd number and the number of PRBs corresponding to the maximum received bandwidth supported by the UE is an even number, the PRB is divided according to the number of PRBs;

Method 2:

The PRB is divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth; when the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the maximum supported by the UE When the parity of the number of PRBs corresponding to the received bandwidth is different and the PRB is divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth, the N is n+1 or nl.

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. Step 503: The UE receives downlink information on a current downlink system bandwidth.

Corresponding to the method shown in FIG. 5, the present invention further provides a user equipment. As shown in FIG. 6, the user equipment includes:

a bandwidth judging module, configured to determine whether a maximum receiving bandwidth supported by the bandwidth is smaller than a current downlink system bandwidth;

a downlink information receiving module, configured to receive downlink information, and if it is determined that the maximum received bandwidth supported by the downlink system is smaller than the current downlink system bandwidth, the downlink information is received on the N PRBs. Otherwise, at the current The downlink information is received on the downlink system bandwidth, where l ^N^n+l , n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE.

Specifically, the PRB division method corresponding to the N PRBs is determined according to one of the following manners: Mode 1: The PRB division is performed according to the parity of the PRB number corresponding to the maximum reception bandwidth supported by the UE.

Method 2:

The PRB is divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth; when the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the maximum supported by the UE When the parity of the number of PRBs corresponding to the received bandwidth is different, and the PRB is divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth, the N is n, n+1 or nl.

Maximum receiving bandwidth supported by the UE when the UE supports two types of maximum receiving bandwidths The number of corresponding PRBs is an odd number nl and an even number n2, respectively, and when the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth,

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl. The method of the above embodiment will be described below through several application examples from the perspective of the UE.

Application example 1 :

This application example describes a case where the downlink system bandwidth is 5 MHz, and the MTC UE's reception maximum bandwidth is 1.4 MHz, and 6 PRBs are described. The MTC UE uses the second mode to implement downlink information transmission, that is, PRB division according to the parity of the PRB number corresponding to the current downlink system bandwidth.

First, after reading the system bandwidth in the PBCH (Physical Broadcast Channel), the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by the MTC UE. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth. The maximum number of PRBs corresponding to the maximum received bandwidth supported by the MTC UE is an even number. The MTC UE then detects the received downlink information on the downlink resources defined below. Specifically, as shown in Figure 7:

The low-cost bandwidth-limited MTC UE receives downlink information on the downlink resources of N=n=6 PRBs and 1.08 MHz, specifically taking the center frequency of the system bandwidth as the symmetric center, and acquiring 3 PRBs on the upper and lower sides, and the frequency of 540 kHz. Domain resources, each PRB contains 12 subcarriers.

At this time, the MSC UE and the OL UE's PSS/SSS/PBCH (primary synchronization signal, secondary synchronization signal, physical broadcast channel) can share the same channel.

The base station sends downlink information to the MTC UE on the N=n=6 PRBs of the center frequency, where the downlink information occupies a frequency domain bandwidth less than or equal to N, and the DC is located at the center of the N PRBs.

In this application example, the UE detects the received CRS and other downlink control and traffic channels on six consecutive PRBs in the system bandwidth center frequency domain.

Application example 2:

This application example describes a case where the system bandwidth is 3 MHz, the reception bandwidth of the MTC UE is 1.4 MHz, and 6 PRBs. The MTC UE uses the second mode to implement downlink information transmission, that is, performs PRB division according to the parity of the number of PRBs corresponding to the current downlink system bandwidth. First, after reading the system bandwidth in the PBCH, the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by the MTC UE. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth, and the maximum supported by the MTC UE. The number of received bandwidth corresponding PRBs is even. The MTC UE then detects the received downlink information on the downlink resources defined below:

As shown in FIG. 8, the low-cost bandwidth-limited MTC UE receives downlink information on a downlink resource of N=n-1=6-1=5 PRBs and 900 kHz, where the downlink domain occupies less than the frequency domain bandwidth. Or equal to N, specifically taking the DC subcarrier as the center, and obtaining 2.5 PRBs on the upper and lower sides respectively, 450 kHz. At this time, the low-cost limited UE and the OL UE have the same PRB, and can share the same channel (including the PDSCH, ePDCCH, etc.).

In this application example, the UE detects and receives CRS and other downlink control and traffic channels on five consecutive PRBs in the system bandwidth center frequency domain.

Application example 3:

This application example describes a case where the system bandwidth is 3 MHz and the reception bandwidth of the MTC UE is 1.4 MHz and 6 PRBs. The MTC UE uses the second mode to implement downlink information transmission, that is, PRB division according to the parity of the PRB number corresponding to the current downlink system bandwidth.

First, after reading the system bandwidth in the PBCH, the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by the MTC UE. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth, and the maximum supported by the MTC UE. The number of PRBs corresponding to the receiving bandwidth is an even number. The MTC UE then detects the received downlink information on the downlink resources defined below:

As shown in Figure 9, the low-cost bandwidth-limited MTC UE is N=n+1=6+1=7 PRBs.

The downlink information is received on the downlink resource of 1.26 MHz, where the frequency domain bandwidth occupied by the downlink information is less than or equal to N. Specifically, the MTC UE with low cost bandwidth is centered on the DC subcarrier, and the upper and lower sides respectively obtain 3.5. PRB, 630kHz.

At this time, the UE with limited cost bandwidth has the same PRB corresponding to the OL UE, and can share the same channel.

In this application example, the UE detects and receives CRS and other downlink control and traffic channels on seven consecutive PRBs in the system bandwidth center frequency domain.

Application example 4: This application example describes a case where the system bandwidth is 5 MHz, and the reception bandwidth of the MTC UE is 1.4 MHz, and 6 PRBs are described. The MTC UE uses the second mode to implement downlink information transmission, that is, performs PRB division according to the parity of the number of PRBs corresponding to the current downlink system bandwidth.

As shown in FIG. 10, the low-cost bandwidth-limited MTC UE performs PRB partitioning according to an odd number of PRBs, and receives downlink information on downlink resources of N=n=6 PRBs and 900 kHz, specifically, acquired by the MTC UE. The total number of PRBs is still six, but the upper and lower sides respectively obtain unequal frequency domain resources. For example, 2.5 PRBs are obtained above, 450 kHz, and 3.5 PRBs, 630 kHz are obtained below. Then define different guard bands on both sides of the system bandwidth.

At this time, the UE with low cost bandwidth limitation has the same PRB corresponding to the OL UE, and can share the same channel.

In this application example, the UE detects and receives CRS and other downlink control and traffic channels on six consecutive PRBs in the system bandwidth center frequency domain.

Application example 5:

This application example describes the case where the system bandwidth is 10 MHz and the reception bandwidth of the MTC UE is 1.4 MHz at 6 RBs. In this application example, the number of PRBs corresponding to the current downlink system bandwidth is the same as the parity of the number of PRBs corresponding to the maximum received bandwidth supported by the MTC UE, and may be considered as performing PRB according to the parity of the PRB number corresponding to the current downlink system bandwidth. The division may also be considered as performing PRB division according to the parity of the number of PRBs corresponding to the maximum reception bandwidth supported by the MTC UE.

First, after reading the system bandwidth in the PBCH, the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by the MTC UE. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth, and the maximum supported by the MTC UE. The number of received bandwidth corresponding PRBs is also an even number. The MTC UE detects the received downlink information on the downlink resources of the six PRBs corresponding to the maximum received bandwidth. At this time, the low-cost bandwidth-limited UE has the same PRB corresponding to the OL UE, and can share the same channel.

Application example 6:

This application example describes the case where the reception bandwidth of the MTC UE is 1.4 MHz or 3 MHz, 6 RBs or 15 RBs. In the application example, when the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth,

When the number of PRBs corresponding to the system bandwidth is an even number, the N is 6;

When the number of PRBs corresponding to the system bandwidth is an odd number, the N is 15.

The system bandwidth is 10MHz or 5MHz, and the system bandwidth corresponds to a number of PRBs of 50 or 25.

After reading the system bandwidth in the PBCH, the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by the MTC UE. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth 10 MHz, and the MTC UE is in its The downlink information is detected on the downlink resources of the six PRBs corresponding to the supported receiving bandwidth.

Or

After reading the system bandwidth in the PBCH, the MTC UE first compares the system bandwidth with the maximum received bandwidth supported by itself. Here, it is obviously greater than the number of PRBs corresponding to the system bandwidth of 5 MHz, and the MTC UE is in its The downlink information is detected on the downlink resources of the 15 PRBs corresponding to the supported receiving bandwidth.

In the above two cases, the number of PRBs corresponding to the current downlink system bandwidth is the same as the parity of the number of PRBs corresponding to the maximum received bandwidth supported by the MTC UE, and may be considered as the parity of the number of PRBs corresponding to the current downlink system bandwidth. The PRB division may also be considered as a PRB division according to the parity of the number of PRBs corresponding to the maximum reception bandwidth supported by the MTC UE;

In this application example, the UE detects the received CRS and other downlink control and traffic channels on consecutive 6 or 15 PRBs in the system bandwidth center frequency domain. The foregoing application example is described by using the MTC UE as an example. However, the method for receiving the downlink physical channel and the bandwidth acquisition method can be applied to other scenarios, and is applied to other types of UEs, and is not limited to the MTC UE.

The method, the base station, and the user equipment of the present invention define a unified resource mapping rule between the base station and the user equipment in a scenario where the system bandwidth and the maximum receiving bandwidth of the user equipment are different, thereby ensuring effective communication between the base station and the MTC UE, so that different The UE can share the same channel and improve resource utilization.

Based on the original LTE system, the present invention proposes a low-bandwidth limited MTC UE downlink system bandwidth acquisition method, and according to this configuration, the small bandwidth MTC UE can successfully acquire the CRS, and can smoothly demodulate the downlink control. And the service information, which promotes the evolution of the MTC service from the GSM system to the LTE system, seamlessly integrates into the LTE network, and promotes the rapid evolution of the M2M service from the GSM system to the LTE system, and can improve the original spectrum efficiency.

It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial Applicability The method of the present invention defines a unified resource mapping rule between a base station and a user equipment in a scenario where the system bandwidth and the maximum receiving bandwidth of the user equipment are different, so that effective communication between the base station and the MTC UE is ensured, so that different UEs can be shared. The same channel improves resource utilization.

Claims

claims

1. A downlink information transmission method, including:

The base station determines whether the maximum reception bandwidth supported by the user equipment (UE) is less than the current downlink system bandwidth; if the judgment is yes, the base station transmits the downlink information of the UE on N PRBs; otherwise, the base station transmits the downlink information of the UE on the current downlink system bandwidth. Transmit the downlink information of the UE, where l^N^n+l, n is the number of PRBs corresponding to the maximum reception bandwidth supported by the UE.

2. The method of claim 1, wherein:

The N PRBs are the N PRBs in the center frequency domain of the downlink system bandwidth, or the N PRBs specified by signaling.

3. The method of claim 1, wherein:

The N PRBs corresponding to the user equipment access system process are different from the N PRBs corresponding to the user equipment non-access system process, or the N PRBs corresponding to the downlink control information are different from the N PRBs corresponding to the downlink data carried by the physical downlink shared channel. different.

4. The method of claim 1, wherein:

5. The method of claim 4, wherein:

The PRB division method corresponding to the N PRBs is determined according to the parity of the number of PRBs corresponding to the maximum reception bandwidth supported by the UE, and/or, determined according to the parity of the number of PRBs corresponding to the current downlink system bandwidth.

6. The method of claim 5, wherein:

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the parity of the number of PRBs corresponding to the current downlink system bandwidth and the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE are different, and according to the current When PRB division is performed based on the odd or even number of PRBs corresponding to the downlink system bandwidth, the N is n, n+1 or nl.

7. The method of claim 1, wherein:

When the UE supports two types of maximum receiving bandwidth, the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE is odd n1 and even n2 respectively, and the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth. hour,

When the number of PRBs corresponding to the current downlink system bandwidth is an even number, the N is n2; and

When the number of PRBs corresponding to the current downlink system bandwidth is an odd number, the N is nl.

8. A downlink information transmission method, including:

The user equipment (UE) determines whether the maximum reception bandwidth supported by the UE is less than the current downlink system bandwidth; if the determination is yes, the UE receives downlink information on N PRBs, otherwise, the UE receives downlink information on the current downlink system bandwidth. information, where l^N^n+l, n is the number of PRBs corresponding to the maximum reception bandwidth supported by the UE.

9. The method of claim 8, wherein:

10. The method of claim 8, wherein:

11. The method of claim 8, wherein:

12. The method of claim 11, wherein:

13. The method of claim 12, wherein:

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE are of different parity, and according to the current When PRB division is performed based on the odd or even number of PRBs corresponding to the downlink system bandwidth, the N is n+1 or n-1.

14. The method of claim 8, wherein:

15. A base station, including:

A bandwidth judgment module, which is configured to judge whether the maximum reception bandwidth supported by the user equipment (UE) is less than the current downlink system bandwidth;

A downlink information sending module, which is configured to send downlink information to the UE. If it is determined that the maximum receiving bandwidth supported by the UE is less than the current downlink system bandwidth, then the downlink information of the UE is transmitted on N PRBs, otherwise, in the current The downlink information of the UE is transmitted on the downlink system bandwidth, where l≤N≤n+l, n is the number of PRBs corresponding to the maximum reception bandwidth supported by the UE.

16. The base station as claimed in claim 15, wherein:

17. The base station as claimed in claim 16, wherein:

When the maximum downlink system bandwidth supported by the UE is less than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE The parity of the number is different, and when the PRBs are divided according to the parity of the number of PRBs corresponding to the current downlink system bandwidth, the N is n, n+1 or nl.

18. The base station as claimed in claim 15, wherein:

19. A user equipment, including:

A bandwidth judgment module, which is configured to judge whether the maximum reception bandwidth supported by the user equipment is less than the current downlink system bandwidth;

A downlink information receiving module, which is configured to receive downlink information. If it is determined that the maximum receiving bandwidth supported by the user equipment is less than the current downlink system bandwidth, then receive the downlink information on N PRBs; otherwise, receive the downlink information on the current downlink system bandwidth. , where l^N^n+l, n is the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE.

20. The user equipment as claimed in claim 19, wherein:

21. The user equipment as claimed in claim 19, wherein:

22. The user equipment as claimed in claim 19, wherein:

The PRB division method corresponding to the N PRBs is determined according to the parity of the number of PRBs corresponding to the current downlink system bandwidth, and/or according to the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE. Odd or even is determined.

23. The user equipment as claimed in claim 22, wherein:

When the maximum downlink system bandwidth supported by the UE is smaller than the current downlink system bandwidth, the number of PRBs corresponding to the current downlink system bandwidth and the number of PRBs corresponding to the maximum receiving bandwidth supported by the UE are of different parity, and according to the current When PRB division is performed based on the odd or even number of PRBs corresponding to the downlink system bandwidth, the N is n, n+1 or n-1.

24. The user equipment as claimed in claim 19, wherein: