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FLEXIBLE MULTIPLEXING MECHANISM FOR COEXISTENCE OF URLLC AND eMBB
                                            SERVICES IN 5G NETWORKS


                            1,2       1,2           1        1             1          1             1
                     Kai Xiao , Xing Liu , Xianghui Han , Peng Hao , Junfeng Zhang , Dong Zhou , Xingguang Wei
                                                  1 ZTE Corporation, China
                               2 State Key Laboratory of Mobile Network and Mobile Multimedia, China




                              ABSTRACT                        by mMTC [3], [4]. From the current development trend, 5G
                                                              mainly focuses on eMBB for basic daily needs and URLLC
           5G mobile networks are envisioned to support both evolved   for emerging industries. Generally, the priority of a URLLC
           mobile  broadband (eMBB)  and  ultra-reliable  and low   service is higher than that of an eMBB service [5] to [7]. In
           latency communications (URLLC), which may coexist and   practical application, eMBB services and URLLC services
           interfere with each other in the same service cell in many   will appear  in  the  same  network,  and  the  scheduling  of  a
           scenarios. In this paper, we propose a dynamic 2-dimension   URLLC  service  by  gNB  will  inevitably  conflict  with  the
           bitmap resource indication to cancel eMBB services with a   eMBB  service  as  the  triggering  of  the  URLLC  service  is
           finer uplink cancellation granularity and a lower probability   sporadic [8]. Once the URLLC service arrives, the gNB shall
           of false cancellation.  Meanwhile,  a  resource indication   allocate appropriate uplink (UL) resources for it as soon as
           based power control method is introduced to dynamically   possible to meet the stringent latency requirements. However,
           indicate different power  control parameters to the user   the  resources  may  have  been  allocated  to  uplink  data
           equipment (UE) based on different time-frequency resource   transmission  for  eMBB  in  advance.  The  latency  and
           groups and  the proportion  of overlapping resources, by   reliability requirement of URLLC transmission can hardly be
           which the reliability of URLLC transmission is guaranteed   guaranteed due to no resource being used within a certain
           while the impact on performance of the eMBB service  is   time interval [9], [10]. Therefore, it is valuable to study how
           minimized. Furthermore, a dynamic selection mechanism is   to multiplex the transmission resources between a URLLC
           proposed to accommodate the varying cases  in  different   service and eMBB service.
           scenarios. Extensive system level simulations are conducted
           and the simulation results show that about 10.54% more   Currently, power control and UL cancellation indication (CI)
           URLLC UEs satisfy the requirements, and the user perceived   mechanisms  are  introduced  into  the  Third  Generation
           throughput of eMBB UEs is increased by 23.26%.     Partnership Project (3GPP) protocol as two independent and
                                                              basic solutions to URLLC and eMBB service multiplexing
           Keywords - 5G, eMBB, power control, resource indication,   [11]. However, these baseline methods have some inherent
                        uplink cancellation, URLLC            disadvantages. More specifically, the baseline cancellation
                                                              indication  (BCI)  method  is  based  on  the  semi-static  2-
                         1.  INTRODUCTION                     dimension  (2-D)  bitmap  implementation.  However,  the
                                                              URLLC service is dynamic and mutative, and the semi-static
           Wireless  communication  services  cover  more  and  more   pattern indication is difficult to meet the changing service
           application  scenarios,  with the increasing  degree of  social   requirements  [12].  For  the  baseline  power  control  (BPC)
           digitization.  Among  them,  enhanced  mobile  broadband   method,  the  power  boosting  is  based  on  a  relatively  fixed
           (eMBB),  ultra-reliable  and  low  latency  communication   value. For some cases where the proportion of overlapping
           (URLLC)  and  massive  machine  type  of  communication   resources  over  all  scheduled  resources  is  very  small,  the
           (mMTC) have become three major scenarios supported by   fixed setting of power boosting value will cause power waste
           fifth  generation  (5G)  systems  [1],  [2].  Large  flow  mobile   and degrade the eMBB performance [13]. On the other hand,
           broadband  services  such  as  ultra-high  definition  and  3D   the  BPC  cannot  further  boost  power  to  protect  URLLC
           video  are  mainly  included  with  eMBB,  providing  the   transmission in the case of poor channel quality [14]. This
           ultimate communication experience for people. Driverless,   paper is mainly to solve these existing technical problems
           industrial  automation  and  so  on  are  mainly  covered  by   above.
           URLLC,  requiring  low-latency  data  and  an  extremely
           reliable connection, i.e., one-way latency up to 1 ms with 10 -  In  this  work,  a  dynamic  pattern  cancellation  indication
           5  outage probability. The scene of large-scale machine class   (DPCI) is proposed for making up the shortcomings of BCI.
           communication in the Internet of things is mainly supported   The proposed DPCI method enhances the current 2-D bitmap





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