diff --git a/MdePkg/Include/IndustryStandard/Acpi50.h b/MdePkg/Include/IndustryStandard/Acpi50.h
index 46dcdb9507..31a47e6a2c 100644
--- a/MdePkg/Include/IndustryStandard/Acpi50.h
+++ b/MdePkg/Include/IndustryStandard/Acpi50.h
@@ -3,6 +3,7 @@
 
   Copyright (c) 2014 Hewlett-Packard Development Company, L.P.<BR>
   Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -2057,6 +2058,11 @@ typedef struct {
 ///
 #define EFI_ACPI_5_0_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_5_0_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SLIC" MS Software Licensing Table Specification
 ///
diff --git a/MdePkg/Include/IndustryStandard/Acpi51.h b/MdePkg/Include/IndustryStandard/Acpi51.h
index 0132f25de8..fc28ffa18f 100644
--- a/MdePkg/Include/IndustryStandard/Acpi51.h
+++ b/MdePkg/Include/IndustryStandard/Acpi51.h
@@ -4,6 +4,7 @@
   Copyright (c) 2014 Hewlett-Packard Development Company, L.P.<BR>
   Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>
   (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -2078,6 +2079,11 @@ typedef struct {
 ///
 #define EFI_ACPI_5_1_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_5_1_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SLIC" MS Software Licensing Table Specification
 ///
diff --git a/MdePkg/Include/IndustryStandard/Acpi60.h b/MdePkg/Include/IndustryStandard/Acpi60.h
index 94a30a81b3..5dcd73b6f1 100644
--- a/MdePkg/Include/IndustryStandard/Acpi60.h
+++ b/MdePkg/Include/IndustryStandard/Acpi60.h
@@ -3,6 +3,7 @@
 
   Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
   (C) Copyright 2015-2016 Hewlett Packard Enterprise Development LP<BR>
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -2321,6 +2322,11 @@ typedef struct {
 ///
 #define EFI_ACPI_6_0_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_6_0_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SLIC" MS Software Licensing Table Specification
 ///
diff --git a/MdePkg/Include/IndustryStandard/Acpi61.h b/MdePkg/Include/IndustryStandard/Acpi61.h
index 985c8273ce..8626833a79 100644
--- a/MdePkg/Include/IndustryStandard/Acpi61.h
+++ b/MdePkg/Include/IndustryStandard/Acpi61.h
@@ -3,6 +3,7 @@
 
   Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -2353,6 +2354,11 @@ typedef struct {
 ///
 #define EFI_ACPI_6_1_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_6_1_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SLIC" MS Software Licensing Table Specification
 ///
diff --git a/MdePkg/Include/IndustryStandard/Acpi62.h b/MdePkg/Include/IndustryStandard/Acpi62.h
index 5a5e9b8112..1b2704e98e 100644
--- a/MdePkg/Include/IndustryStandard/Acpi62.h
+++ b/MdePkg/Include/IndustryStandard/Acpi62.h
@@ -2,6 +2,7 @@
   ACPI 6.2 definitions from the ACPI Specification Revision 6.2 May, 2017.
 
   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -2879,6 +2880,11 @@ typedef struct {
 ///
 #define EFI_ACPI_6_2_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_6_2_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SDEI" Software Delegated Exceptions Interface Table
 ///
diff --git a/MdePkg/Include/IndustryStandard/Acpi63.h b/MdePkg/Include/IndustryStandard/Acpi63.h
index eca1f9357b..b281b30155 100644
--- a/MdePkg/Include/IndustryStandard/Acpi63.h
+++ b/MdePkg/Include/IndustryStandard/Acpi63.h
@@ -2,7 +2,7 @@
   ACPI 6.3 definitions from the ACPI Specification Revision 6.3 Jan, 2019.
 
   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
-  Copyright (c) 2019, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2019 - 2020, ARM Ltd. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
@@ -2880,6 +2880,11 @@ typedef struct {
 ///
 #define EFI_ACPI_6_3_DATA_MANAGEMENT_TABLE_SIGNATURE  SIGNATURE_32('M', 'S', 'D', 'M')
 
+///
+/// "PCCT" Platform Communications Channel Table
+///
+#define EFI_ACPI_6_3_PLATFORM_COMMUNICATIONS_CHANNEL_TABLE_SIGNATURE  SIGNATURE_32('P', 'C', 'C', 'T')
+
 ///
 /// "SDEI" Software Delegated Exceptions Interface Table
 ///